#define taskname "G"
#include <bits/stdc++.h>
#define int long long

using namespace std;
const string l = "? left", r = "? right", f = "? flip";
int x;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

void checksmall()
{
    for (int i=1; i<=50; i++)
    {
        cout<<l<<endl;
        cin>>x;
        if (x) cout<<f<<endl, cin>>x;
    }
    cout<<f<<endl;
    cin>>x;
    for (int i=1; i<=50; i++)
    {
        cout<<r<<endl;
        cin>>x;
        if (x)
        {
            cout<<"! "<<i;
            exit(0);
        }
    }
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    /**
    int tmp = 1101 = 13
    append 1
    tmp %= (1<<3)
    tmp <<= 1
    tmp |= 1
    **/
//    int tmp = 13;
//    tmp %= (1<<3);
//    tmp <<= 1;
//    tmp |= 1;
//    cout<<tmp;
    cin>>x;
    if (x) cout<<f<<endl, cin>>x;
    checksmall();
    int rnd = 0, rrnd = 0;
    for (int i=0; i<30; i++)
    {
        int x = rng() & 1;
        rnd += x * (1ll<<i);
        if (i < 29) rrnd += x * (1ll<<i);
    }
//    cout<<rnd<<"\n";
//    cout<<(rnd << 1) % (1ll << 30);
//    cout<<rnd % (1ll<<29)<<" "<<rrnd<<" "<<(((rnd<<1) % (1ll<<30))|(rnd&1))<<"\n";
    for (int i=0; i<30; i++)
    {
        cout<<l<<endl;
        cin>>x;
        if (x != (rnd >> (29-i) & 1)) cout<<f<<endl, cin>>x;
    }
    int cur = rnd;
    for (int i=1; i<=1e5; i++)
    {
        cout<<l<<endl;
        cin>>x;
        cur = cur % (1ll<<29);
        cur <<= 1;
        cur |= x;
        if (cur == rnd) return cout<<"! "<<i, 0;
    }
}