#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
template<class T> bool chmax(T &a, const T &b) { if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------


int T;
double R=0;//3.14159265351e-2;

int ask(long double D) {
	cout<<fixed<<setprecision(10)<<"? "<<D<<endl;
	if(R) {
		return D<=R;
	}
	string s;
	cin>>s;
	return s=="Yes";
	
}


void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>T;
	while(T--) {
		if(ask(167.7717663)) {
			long double L=log(167.7717663);
			long double R=log(12.22e74);
			FOR(i,23) {
				long double mi=(L+R)/2;
				if(ask(exp(mi))) {
					L=mi;
				}
				else {
					R=mi;
				}
			}
			cout<<fixed<<setprecision(10)<<"! "<<exp((L+R)/2)<<endl;
		}
		else {
			long double L=1e-6;
			long double R=167.7717663;
			FOR(i,23) {
				long double mi=(L+R)/2;
				if(ask(mi)) {
					L=mi;
				}
				else {
					R=mi;
				}
			}
			cout<<fixed<<setprecision(10)<<"! "<<((L+R)/2)<<endl;
		}
	}
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}