#include <bits/stdc++.h>
using namespace std;
#define int long long
mt19937_64 rng(std::chrono::system_clock::now().time_since_epoch().count());
const int mxn = 200005;
signed main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    vector<int>arr(mxn);
    vector<int>op(mxn);
    cin >> arr[0];
    for(int i = 1; i<=250; i++){
        cout << "? right" << endl;
        int v;
        cin >> v;
        arr[i] = v;
        if(rng()%2){
            cout << "? flip" << endl;
            op[i] = 1;
            int x;
            cin >> x;
        }
    }
    for(int n = 3; n<=100; n++){
        bool good = true;
        vector<int>dp(500);
        for(int i = 1; i<=n; i++){
            dp[i] = arr[i];
        }
        for(int i = n+1; i<=250; i++){
            dp[i] = dp[i-n]^op[i];
            if(dp[i] != arr[i]){
                good = false;
                break;
            }
        }
        if(good){
            cout << "! " << n << endl;
            return 0;
        }
    }
    int cur = 251;
    for(int i = 101; i<=5000; i++){
        cout << "? right" << endl;
        cin >> arr[cur];
        if(rng()%2){
            cout << "? flip" << endl;
            op[cur] = 1;
            int x;
            cin >> x;
        }
        cur++;
        cout << "? right" << endl;
        cin >> arr[cur];
        if(rng()%2){
            cout << "? flip" << endl;
            op[cur] = 1;
            int x;
            cin >> x;
        }
        cur++;
        bool good = true;
        for(int j = 1; j<=i; j++){
            if(arr[j+i] != (arr[j]^op[j])){
                good = false;
            }
        }
        if(good){
            cout << "! " << i << endl;
            return 0;
        }
    }
    return 0;
}