#include <stdio.h>
#include <math.h>

int main(){
	int t;
	scanf("%d",&t);
	while(t--){
		double lo=-1e5;
		double hi=log(12.22e74)/log(1+1e-5);
		for(int i=25;i--;){
			double m=(lo+hi)/2;
			double y;
			if(m>=0){
				y=pow(1+1e-5,m);
			}else{
				y=1.0+m*1e-5;
			}
			printf("%c %.8f\n",i?'?':'!',y);
			fflush(stdout);
			if(i){
				char res[8];
				scanf("%s",res);
				if(res[0]=='Y'){
					lo=m;
				}else{
					hi=m;
				}
			}
		}
	}
	return 0;
}