#include<bits/stdc++.h>
using namespace std;
int main(){
	int t;
	cin>>t;
	while(t--){
		string a;
		cin>>a;
		int s=0;
		bool f=1;
		for(int i=0;i<a.size();i++){
			if(a[i]=='A'){
				s+=4;
			}else if(a[i]=='B'){
				s+=3;
			}else if(a[i]=='C'){
				s+=2;
			}else if(a[i]=='D'){
				s+=1;
			}else if(a[i]!='F'){
				f=0;
				break;
			}
		}
		if(f)cout<<fixed<<setprecision(2)<<s*1.0/a.size()<<endl;
		else cout<<"Unknown"<<endl;
	}	
	return 0;
}