#include <bits/stdc++.h>
#define ll long long
#define pb push_back

using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);

	int pos = 0, cur = 1, dir = 1, l = 0, r = 0;
	map<int, int> a;

	int x;
	cin >> x;
	a[0] = x;

	bool cont = true;
	while(true)
    {
        for(int i=0; i<cur; i++)
        {
            //cout << pos << "\n";
            if(dir==1)
            {
                cout << "? right\n";
                cout.flush();
            }
            else
            {
                cout << "? left\n";
                cout.flush();
            }

            pos += dir;
            l = min(l, pos);
            r = max(r, pos);

            cin >> x;
            if(a.find(pos) == a.end()) a[pos] = x;
            else if(a[pos] != x)
            {
                cont = false;
                break;
            }
        }

        if(!cont) break;

        cout << "? flip\n";
        cout.flush();
        cin >> x;
        a[pos] = x;

        cur = 2 * cur + 1;
        dir *= -1;
    }

    if(dir==1) cout << "! " << pos - l << "\n";
    else cout << "! " << r - pos << "\n";
    cout.flush();
}