var
  f: text;
  s: string;
  i, j, p: integer;

begin
  AssignFile(f, 'output.txt');
  Reset(f);
  j := 60;
  i := 2;
  for p := 1 to 30 do
  begin
    readln(f, s);
    delete(s, i, 1);
    insert('x', s, i);
    inc(i, 2);
    delete(s, j, 1);
    insert('x', s, j);
    dec(j, 2);
    writeln(s);
  end;
  close(f);
end.