const m:array[0..99]of integer=
        (
        0,1,5,2,8,3,9,2,8,7,
        7,8,4,7,3,8,4,1,5,4,
        4,5,9,6,2,7,3,6,2,1,
        1,2,8,1,7,2,8,5,9,8,
        8,9,3,0,6,1,7,0,6,5,
        5,6,2,5,1,6,2,9,3,2,
        2,3,7,4,0,5,1,4,0,9,
        9,0,6,9,5,0,6,3,7,6,
        6,7,1,8,4,9,5,8,4,3,
        3,4,0,3,9,4,0,7,1,0);
var s :ansistring;
    i, t, n:longint;
    buf1:array[1..1 shl 17] of char;
begin
  Assign(input,'cifra.in');
   reset(input);
   settextbuf(input,buf1);

 Assign(output,'cifra.out');
  Rewrite(output);

readln(t);
while t<>0 do
  begin
   readln(s);
   n:=ord(s[length(s)])-48;
   if length(s)>1 then
   n:=n+(ord(s[length(s)-1])-48)*10;
   writeln(m[n]);
  dec(t);
  end;

 close(output);
end.