11777

#include <iostream>
#include <cstdio>
#include <sstream>
#include <string>

using namespace std;

int main()
{
	int tt,kase=1;
	double s,a,MN,avg;
	cin>>tt;

	while(tt--)
	{
		MN=25;
		s = 0;
		avg = 0;
		for(int i=0;i<4;i++)
		{
			cin>>a;
			s+=a;
		}
		for(int i=0;i<3;i++)
		{
			cin>>a;
			avg+=a;
			if(a<MN)
			MN=a;
		}
		avg-=MN;
		avg/=2;
		s+=avg;
		if(s>=90)
			cout<<"Case "<<kase++<<": A\n";
		else if(s>=80)
			cout<<"Case "<<kase++<<": B\n";
		else if(s>=70)
			cout<<"Case "<<kase++<<": C\n";
		else if(s>=60)
			cout<<"Case "<<kase++<<": D\n";
		else
			cout<<"Case "<<kase++<<": F\n";
	}
	return 0;
}