#include <bits/stdc++.h>
using namespace std;
const int MAXN = 15;
const int MAXA = 1000000000;
int n;
char opt[MAXN];
int Read() {
  int x = 0, f = 1;
  char c = getchar();
  while (c > '9' || c < '0') {
    if (c == '-') f = -1;
    c = getchar();
  }
  while (c >= '0' && c <= '9') {
    x = (x * 10) + (c ^ 48);
    c = getchar();
  }
  return x * f;
}
void Put1(int x) {
  if (x > 9) Put1(x / 10);
  putchar(x % 10 ^ 48);
}
void Put(int x, char c = -1) {
  if (x < 0) putchar('-'), x = -x;
  Put1(x);
  if (c >= 0) putchar(c);
}
template <typename T>
T Max(T x, T y) {
  return x > y ? x : y;
}
template <typename T>
T Min(T x, T y) {
  return x < y ? x : y;
}
template <typename T>
T Abs(T x) {
  return x < 0 ? -x : x;
}
bool Ask(int x, int y) {
  printf("? %d %d\n", x, y);
  fflush(stdout);
  scanf("%s", opt);
  return opt[0] == 'x';
}
int main() {
  while (520) {
    scanf("%s", opt);
    if (!strcmp(opt, "end")) break;
    if (Ask(0, 1)) {
      printf("! 1\n");
      fflush(stdout);
      continue;
    }
    int l, r;
    for (int i = 1; i <= MAXA; i <<= 1) {
      if (Ask(i, Min(i << 1, MAXA << 1))) {
        l = i;
        r = Min(i << 1, MAXA << 1);
        break;
      }
    }
    while (l + 1 < r) {
      int mid = (l + r) >> 1;
      if (Ask(l, mid))
        r = mid;
      else
        l = mid;
    }
    printf("! %d\n", r);
    fflush(stdout);
  }
  return 0;
}
