#!/usr/bin/python
list1 =map(str,raw_input().split())
sum = 0
for ss in list1:
	ss=ss.upper()
	if   ss=='A':
	    sum=sum+1
	elif ss=='B':
	    sum=sum+2
	elif ss=='C':
	    sum=sum+3
	elif ss=='D':
	    sum=sum+4
print sum