/* -*- coding: utf-8 -*-
 *
 * 2925.cc:  No.2925 2-Letter Shiritori - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  char s[4];
  scanf("%s", s);
  int st = s[0] - 'a';

  printf("? %c%c\n", 'a' + st, 'a' + st); fflush(stdout);
	 
  for (;;) {
    char op[4], s[4];
    scanf("%s%s", op, s);

    if (op[0] == '?') {
      int u = s[0] - 'a', v = s[1] - 'a';
      printf("? %c%c\n", 'a' + v, 'a' + st); fflush(stdout);
    }
    else {
      break;
    }
  }

  return 0;
}