#include<bits/stdc++.h>
using namespace std;
#define ALL(x) x.begin(),x.end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define debug(v) cout<<#v<<":";for(auto x:v){cout<<x<<' ';}cout<<endl;
#define mod 1000000007
using ll=long long;
const int INF=1000000000;
const ll LINF=1001002003004005006ll;
int dx[]={1,0,-1,0},dy[]={0,1,0,-1};
// ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
template<class T>bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template<class T>bool chmin(T &a,const T &b){if(b<a){a=b;return true;}return false;}
 
// struct IOSetup{
//     IOSetup(){
//         cin.tie(0);
//         ios::sync_with_stdio(0);
//         cout<<fixed<<setprecision(12);
//     }
// } iosetup;
 
template<typename T1,typename T2>
ostream &operator<<(ostream &os,const pair<T1,T2>&p){
    os<<p.first<<" "<<p.second;
    return os;
}
 
template<typename T>
ostream &operator<<(ostream &os,const vector<T>&v){
    for(int i=0;i<(int)v.size();i++) os<<v[i]<<(i+1==(int)v.size()?"":" ");
    return os;
}

template<typename T1,typename T2>
istream &operator>>(istream &is,pair<T1,T2>&p){
    is>>p.first>>p.second;
    return is;
}

template<typename T>
istream &operator>>(istream &is,vector<T>&v){
    for(T &x:v)is>>x;
    return is;
}


signed main(){
    int lw=1,hi=1000;
    int res=0;
    while(lw<=hi){
        int mid=(lw+hi)/2;
        string s,t;
        cout<<"? "<<mid<<endl;
        cin>>s;
        cout<<"? "<<mid+1<<endl;
        cin>>t;
        bool f=false;
        if(s[0]=='s') chmax(res,mid),f=true;
        if(t[0]=='s') chmax(res,mid+1),f=true;
        if(f) lw=mid+1;
        else  hi=mid-1;
    }
    cout<<"! "<<res<<endl;
    return 0;
}