s=input()
a=["a","d","g","j","m","p","t","w"," "]
b=["b","e",'h','k','n','q','u','x']
c=['c','f','i','l','o','r','v','y']
d=["s",'z']
k=0
for i in range(len(s)):
	if s[i] in a:
		k+=1
	elif s[i] in b:
		k+=2
	elif s[i] in c:
		k+=3
	else:
		k+=4
print(k)