N1_v1

s=''
with open('f.txt') as f:
    s = f.readline()

ans = 0
i = 0


def f(l):
    global i
    while i + 1 < len(s):
        if s[i] + s[i + 1] == 'QQ':
            return l + 1
        i += 1
        l += 1
        if i + 1 == len(s):
            return l



while i + 1 < len(s):
    if s[i] + s[i + 1] == 'QQ':
        i += 1
        k = f(1)
        ans = max(ans, k)

    i += 1

print(ans)