#include<bits/stdc++.h>
using namespace std;
int main()
{
int n, i;
double a[7], b, c, d, e, f;
while(cin >> n)
{
for(i=1;i<=n;i++)
{
b = c = d = e = f = 0;
cin >> a[0] >> a[1] >> a[2] >> a[3] >> a[4] >> a[5] >> a[6];
b = a[4];
d = a[5];
e = a[6];
if(b < d)
swap(b, d);
if(d < e)
swap(d, e);
f = (b+d)/2;
c = a[0] + a[1] + a[2] + a[3] + f;
cout << "Case " << i << ": ";
if(c >= 90)
cout << "A" << endl;
else if(c>=80 && c < 90)
cout << "B" << endl;
else if(c>=70 && c < 80)
cout << "C" << endl;
else if(c>=60 && c< 70)
cout << "D" << endl;
else if(c<60)
cout << "F" << endl;
}
}
return 0;
}
using namespace std;
int main()
{
int n, i;
double a[7], b, c, d, e, f;
while(cin >> n)
{
for(i=1;i<=n;i++)
{
b = c = d = e = f = 0;
cin >> a[0] >> a[1] >> a[2] >> a[3] >> a[4] >> a[5] >> a[6];
b = a[4];
d = a[5];
e = a[6];
if(b < d)
swap(b, d);
if(d < e)
swap(d, e);
f = (b+d)/2;
c = a[0] + a[1] + a[2] + a[3] + f;
cout << "Case " << i << ": ";
if(c >= 90)
cout << "A" << endl;
else if(c>=80 && c < 90)
cout << "B" << endl;
else if(c>=70 && c < 80)
cout << "C" << endl;
else if(c>=60 && c< 70)
cout << "D" << endl;
else if(c<60)
cout << "F" << endl;
}
}
return 0;
}
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