#include <iostream.h>

void main(void)
{
	int student[10], i=0, a=0, b=0, c=0, d=0, f=0;
	do{	
		cin >> student[i];
		
		switch(student[i]/10){
	
		case 9 :
			a++;
			break;
				
		case 8 :
			b++;
			break;	
		case 7 :
			c++;
			break;	
		case 6 :
			d++;
			break;

		default :
			if(student[i]!=999)
			f++;
			break;
		}
		
		i++;

	}while((student[i-1] != 999) && (i<10));

	cout <<"A :" <<a << "B :" <<b << "C :" <<c << "D :" <<d << "F :" <<f;
}