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#include <bits/stdc++.h>
using namespace std;
typedef list<pair < int, string>>
::iterator pl;
unordered_map <string, pl> ump;
list <pair<int, string>> lists;
char catchmessage[100];
struct ioss {
#define endl '\n'
    static const int LEN = 20000000;
    char obuf[LEN], *oh = obuf;
    std::streambuf *fb;
    ioss() {
        ios::sync_with_stdio(false);
        cin.tie(NULL);
        cout.tie(NULL);
        fb = cout.rdbuf();
    }
    inline char gc() {
        static char buf[LEN], *s, *t, buf2[LEN];
        return (s == t) && (t = (s = buf) + fread(buf, 1, LEN, stdin)), s == t ? -1 : *s++;
    }
    inline ioss &operator>>(long long &x) {
        static char ch, sgn, *p;
        ch = gc(), sgn = 0;
        for (; !isdigit(ch); ch = gc()) {
            if (ch == -1)
                return *this;
            sgn |= ch == '-';
        }
        for (x = 0; isdigit(ch); ch = gc())
            x = x * 10 + (ch ^ '0');
        sgn && (x = -x);
        return *this;
    }
    inline ioss &operator>>(int &x) {
        static char ch, sgn, *p;
        ch = gc(), sgn = 0;
        for (; !isdigit(ch); ch = gc()) {
            if (ch == -1)
                return *this;
            sgn |= ch == '-';
        }
        for (x = 0; isdigit(ch); ch = gc())
            x = x * 10 + (ch ^ '0');
        sgn && (x = -x);
        return *this;
    }
    inline ioss &operator>>(char &x) {
        static char ch;
        for (; !isalpha(ch); ch = gc()) {
            if (ch == -1)
                return *this;
        }
        x = ch;
        return *this;
    }
    inline ioss &operator>>(string &x) {
        static char ch, *p, buf2[LEN];
        for (; !isalpha(ch) && !isdigit(ch); ch = gc())
            if (ch == -1)
                return *this;
        p = buf2;
        for (; isalpha(ch) || isdigit(ch); ch = gc())
            *p = ch, p++;
        *p = '\0';
        x = buf2;
        return *this;
    }
    inline ioss &operator<<(string &c) {
        for (auto &p: c)
            this->operator<<(p);
        return *this;
    }
    inline ioss &operator<<(const char *c) {
        while (*c != '\0') {
            this->operator<<(*c);
            c++;
        }
        return *this;
    }
    inline ioss &operator<<(const char &c) {
        oh == obuf + LEN ? (fb->sputn(obuf, LEN), oh = obuf) : 0;
        *oh++ = c;
        return *this;
    }
    inline ioss &operator<<(int x) {
        static int buf[30], cnt;
        if (x < 0)
            this->operator<<('-'), x = -x;
        if (x == 0)
            this->operator<<('0');
        for (cnt = 0; x; x /= 10)
            buf[++cnt] = x % 10 | 48;
        while (cnt)
            this->operator<<((char) buf[cnt--]);
        return *this;
    }
    inline ioss &operator<<(long long x) {
        static int buf[30], cnt;
        if (x < 0)
            this->operator<<('-'), x = -x;
        if (x == 0)
            this->operator<<('0');
        for (cnt = 0; x; x /= 10)
            buf[++cnt] = x % 10 | 48;
        while (cnt)
            this->operator<<((char) buf[cnt--]);
        return *this;
    }
    ~ioss() {
        fb->sputn(obuf, oh - obuf);
    }
} io;
int main() {
#ifdef ACM_LOCAL
    freopen("./in.txt", "r", stdin);
    freopen("./out.txt", "w", stdout);
#endif
    ios::sync_with_stdio(false);
    int t;
    io >> t;
    while (t--) {
        ump.clear();
        lists.clear();
        int q, m;
        io >> q >> m;
        string s;
        int op, val;
        for (int i = 0; i < q; i++) {
            pl cur;
            io >> op >> s >> val;
            if (op) {
                if (!ump.count(s)) {
                    cout << "Invalid" << endl;
                    continue;
                }
                cur = ump[s];
                if (val == 1) {
                    cur++;
                    if (cur == lists.end()) {
                        cout << "Invalid" << endl;
                        continue;
                    }
                } else if (val == -1) {
                    if (cur == lists.begin()) {
                        cout << "Invalid" << endl;
                        continue;
                    }
                    cur--;
                }
                cout << (*cur).first << endl;
            } else {
                if (!ump.count(s)) {
                    pair<int, string> newnode = make_pair(val, s);
                    lists.push_back(newnode);
                    pl tmp = lists.end();
                    tmp--;
                    ump.insert(make_pair(s, tmp));
                    if (lists.size() > m) {
                        ump.erase(lists.front().second);
                        lists.pop_front();
                    }
                    cout << val << endl;
                    continue;
                }
                cur = ump[s];
                pair<int, string> newnode = make_pair((*cur).first, s);
                lists.push_back(newnode);
                pl tmp = lists.end();
                tmp--;
                ump[s] = tmp;
                lists.erase(cur);
                cout << newnode.first << endl;
            }
        }
    }
    return 0;
}