#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
char str[100];
long long a;
int cnt = 0;
int ask(long long x, long long y)
{
    //cnt++;
    //return x % a >= y % a;
    printf("? %lld %lld\n", x, y);
    fflush(stdout);
    scanf("%s", str);
    fflush(stdout);
    return *str == 'x';
}
int main()
{
    while (scanf("%s", str), fflush(stdout), *str != 'e')
    //while (cnt = 0, scanf("%lld", &a))
    {
        if (ask(0, 1))
            printf("! 1\n");
        else
        {
            long long i;
            for (i = 0; i < 30; i++)
                if (ask(1ll << i, 2ll << i))
                    break;
            long long r = 2ll << i;
            for (--i; i >= 0; i--)
                if (!ask(r - (1ll << i), r))
                    r -= 1ll << i;
            printf("! %lld\n", r);
        }
        fflush(stdout);
    }
    return 0;
}