#pragma ide diagnostic ignored "misc-no-recursion"

#include "bits/stdc++.h"

using namespace std;
typedef long long ll;
typedef double db;

#define TESTCASE 0

static constexpr int MOD = 998'244'353;
static constexpr int INF = 1e9;

static int read() {
    int x;
    cin >> x;
    return x;
}

static int move() {
    cout << "? right" << endl;
    return read();
}

static int flip() {
    cout << "? flip" << endl;
    return read();
}

static void solve([[maybe_unused]] int tc) {
    read();

    mt19937_64 rng(3202916311594768294ll);
    bitset<64> signature = rng();

    bitset<64> B = 0;
    for (int n = 0; ; n++) {

        int x = move();
        B >>= 1;
        B.set(63, x);

        if (n < 64 && signature[n] != x) {
            flip();
        }

        if (signature == B) {
            cout << "! " << (n - 63) << endl;
            return;
        }
    }
}

int main() {
    ios::sync_with_stdio(false);

    if (const char *f = getenv("REDIRECT_STDOUT"); f) {
        freopen(f, "w", stdout);
    }

    int T = 1;
#if TESTCASE
    cin >> T;
#endif

    for (int t = 1; t <= T; t++) {
        solve(t);
    }

    return 0;
}