a=str(input())
if ord(a)==65 or ord(a)==97:
    print(1)
elif ord(a)==66 or ord(a)==98:
    print(2)
elif ord(a)==67 or ord(a)==99:
    print(3)
elif ord(a)==68 or ord(a)==100:
    print(4)
else :
    print(5)