const mat:array[0..99] of byte = (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 n:string;
    x,t,i,code:integer;
    f1,f2:text;

BEGIN
 assign(f1,'cifra.in'); reset(f1);
 assign(f2,'cifra.out'); rewrite(f2);

  readln(f1,t);

  for i:=1 to t do
   begin
    readln(f1,n);
    val(copy(n,length(n)-1,2),x,code);
    writeln(f2,mat[x]);
   end;
 close(f1); close(f2);
END.