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