~cpp
#include <iostream>
using namespace std;
int main()
{
int n[10]={0,},p[5]={0,};
for(int i=0;i<10;i++)
{ cin >> n[i];
switch(n[i]/10){
case 6:
p[0]++;
break;
case 7:
p[1]++;
break;
case 8:
p[2]++;
break;
case 9:
p[3]++;
break;
case 10:
p[3]++;
break;
default:
p[4]++;
break;
}
}
cout << "A:"<<p[3]<<"B:"<<p[2]<<"C:"<<p[1]<<"D:"<<p[0]<<"F:"<<p[4];
return 0;