UPPERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

instructions = input().strip()

i = 0
nop_count = 0

while True:
    try:
        if instructions[i + 1] in UPPERS:
            nop_count += 3
            i += 1
        elif instructions[i + 2] in UPPERS:
            nop_count += 2
            i += 2
        elif instructions[i + 3] in UPPERS:
            nop_count += 1
            i += 3
        else:
            i += 4
    except IndexError:
        print(nop_count)
        exit()