const
  nn=100;
type
  int=longint;
var
  G:array[1..nn,1..nn] of boolean;
  D:array[1..nn,1..nn] of boolean;
  A:array[1..nn] of int; an:int;
  t:int; n,i,j:int;

function c(k:int):int;
begin
  exit((k-1) mod n +1);
end;
procedure init;
var i,j:int;
    t:char;
begin
  fillchar(g,sizeof(g),false);
  fillchar(d,sizeof(d),false);
  an:=0;
  readln(n);
  for i:=1 to n do
  begin
    for j:=1 to n do
    begin
      read(t);
      if t='1' then g[i,j]:=true;
    end;
    readln;
  end;
end;

procedure test(i:int);
var
  j,t:int;
begin
  for t:=1 to n-1 do
  begin
    j:=c(i+t);
    if d[i,j] and d[j,i] and g[i,j] then begin
      inc(an);a[an]:=i;
      exit;
    end;
  end;
end;
procedure print;
var i:Int;
begin
  writeln(an);
  for i:=1 to an do
    writeln(a[i]);
end;
procedure main;
var l,i,j,k,t:int;
begin
  for i:=1 to n-1 do
    d[i,i+1]:=true;
  d[n,1]:=true;
  for l:=2 to n-1 do
    for i:=1 to n do
    begin
      j:=c(i+l);
      for t:=1 to l-1 do
      begin
        k:=c(i+t);
        if D[i,k] and D[k,j] and (G[i,k] or G[j,k]) then
        begin
          D[i,j]:=true;
          break
        end;
      end;
    end;
end;

procedure patch;
var i,j:int;
begin
end;
begin
  readln(t);
  for i:=1 to t do
  begin
    init;main; patch;
    for j:=1 to n do
      test(j);
    print;
  end;
  //readln(n)
end.

your code here