#include <bits/stdc++.h>
#include<atcoder/lazysegtree>
#include<atcoder/segtree>
using namespace atcoder;
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vvvvll = vector<vvvll>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vvvb = vector<vvb>;
using vvvvb = vector<vvvb>;
using vvvvvb = vector<vvvvb>;
#define all(A) A.begin(),A.end()
#define rep(i, n) for (ll i = 0; i < (ll) (n); i++)
template<class T>
bool chmax(T& p, T q, bool C = 1) {
    if (C == 0 && p == q) {
        return 1;
    }
    if (p < q) {
        p = q;
        return 1;
    }
    else {
        return 0;
    }
}
template<class T>
bool chmin(T& p, T q, bool C = 1) {
    if (C == 0 && p == q) {
        return 1;
    }
    if (p > q) {
        p = q;
        return 1;
    }
    else {
        return 0;
    }
}
ll modPow(long long a, long long n, long long p) {
    if (n == 0) return 1; // 0乗にも対応する場合
    if (n == 1) return a % p;
    if (n % 2 == 1) return (a * modPow(a, n - 1, p)) % p;
    long long t = modPow(a, n / 2, p);
    return (t * t) % p;
}
ll gcd(ll(a), ll(b)) {
    if (a == 0)return b;
    if (b == 0)return a;
    ll c = a;
    while (a % b != 0) {
        c = a % b;
        a = b;
        b = c;
    }
    return b;
}
ll sqrtz(ll N) {
    ll L = 0;
    ll R = sqrt(N) + 10000;
    while (abs(R - L) > 1) {
        ll mid = (R + L) / 2;
        if (mid * mid <= N)L = mid;
        else R = mid;
    }
    return L;
}


// using mint = modint998244353;
// using vm = vector<mint>;
// using vvm = vector<vm>;
// using vvvm = vector<vvm>;


// vector<mint> fact, factinv, inv, factK;
// const ll mod = 998244353;
// void prenCkModp(ll n) {
//     //factK.resize(4*n+5);
//     fact.resize(n + 5);
//     factinv.resize(n + 5);
//     inv.resize(n + 5);
//     fact[0] = fact[1] = 1;
//     factinv[0] = factinv[1] = 1;
//     inv[1] = 1;
//     for (ll i = 2; i < n + 5; i++) {
//         fact[i] = (fact[i - 1] * i);
//         inv[i] = (mod - ((inv[mod % i] * (mod / i))));
//         factinv[i] = (factinv[i - 1] * inv[i]);
//     }
//     //factK[0]=1;
//     //for(ll i=1;i<4*n+5;i++){
//     //    factK[i]=factK[i-1]*mint(K-i+1);
//     //    //K*(K-1)*...*(K-i+1);
//     //}
// }
// mint nCk(ll n, ll k) {
//     if (n < k || k < 0) return 0;
//     return (fact[n] * ((factinv[k] * factinv[n - k])));
// }
// //mint nCkK(ll n,ll k){
// //    if(K<n||K-n<k)return 0;
// //    mint res=factK[n+k];
// //    res*=factK[n].inv();
// //    res*=factinv[k];
// //    return res;
// //}


bool DEB = 0;



int main() {

    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll LN=0,HN=1e3;
    map<ll,ll> M;
    while(HN-LN>1){
        ll md=(HN+LN)/2;
        string S;
        if(M[md]==-1){
            S="s";
        }
        else if(M[md]==1){
            S="o";
        }
        else{
            cout<<"? "<<md<<endl;
            cin>>S;
        }

        
        if(S[0]=='o'){
            M[md]=1;
            if(M[md+1]==1){
                S="o";
            }
            else if(M[md+1]==-1){
                S="s";
            }
            else{
                cout<<"? "<<md+1<<endl;
                cin>>S;
            }
            if(S[0]=='o'){
                HN=md;
                M[md+1]=1;
            }
            else{
                LN=md;
                M[md+1]=-1;
            }
        }
        else {
            LN=md;
            M[md]=-1;
        }
    }
    for(ll i=3;i>=0;i--){
        if(M[HN-1+i]==1)continue;
        if(M[HN-1+i]==-1){
            cout<<"! "<<HN-1+i<<endl;
            return 0;
        }
        cout<<"? "<<HN-1+i<<endl;
        string S;
        cin>>S;
        if(S[0]=='s'){
        cout<<"! "<<HN-1+i<<endl;
        return 0;
        }
    }
    

}