#include <iostream>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <ctime>

#define Maxn 5005
#define L 16

using namespace std;

int cur;

int goRight() {
    int ret;
    cout << "? right" << endl; fflush(stdout);
    scanf("%d", &ret);
    return ret;
}
int goLeft() {
    int ret;
    cout << "? left" << endl; fflush(stdout);
    scanf("%d", &ret);
    return ret;
}
void flip() {
    int ret;
    cout << "? flip" << endl; fflush(stdout);
    scanf("%d", &ret);
}
void answer(int x) {
    cout << "! " << x << endl; fflush(stdout);
}

int state[250], rec[10005]; bool isok[20];
void checkSmall() {
    scanf("%d", &cur);
    memset(isok, 1, sizeof(isok));
    for(int i = 0; i < 240; ++i) {
        for(int k = 3; k <= L; ++k) {
            if(i >= k && cur != state[i - k]) isok[k] = 0;
        }
        state[i] = rand() & 1;
        if(cur != state[i]) flip();
        cur = goRight();
    }
}

void checkBig() {
    memset(state, 0, sizeof(state));
    for(int i = 1; i <= 16; ++i) state[i] = rand() & 1;
    for(int i = 1; i <= 16; ++i) {
        cur = goRight();
        if(cur != state[i]) flip();
    }
    int tot = 0;
    while(true) {
        cur = goRight();
        rec[++tot] = cur;
        bool flag = 1;
        for(int i = 1; i <= 16; ++i) {
            if(state[i] != rec[tot - 16 + i]) {
                flag = 0; break;
            }
        }
        if(flag) {
            answer(tot);
            return;
        }
    }
}

int main() {
    srand(time(NULL));
    checkSmall();
    for(int k = 3; k <= L; ++k) {
        if(isok[k]) {
            answer(k);
            return 0;
        }
    }
    checkBig();
    return 0;
}