S = input().strip()
n = len(S)
used = [False] * n
count = 0

target = ['K', 'U', 'R', 'O', 'I']

while True:
    positions = [-1] * 5
    current_pos = -1
    for i in range(5):
        found = False
        for j in range(current_pos + 1, n):
            if not used[j]:
                c = S[j]
                if c == '?':
                    c = target[i]
                if c == target[i]:
                    positions[i] = j
                    used[j] = True
                    current_pos = j
                    found = True
                    break
        if not found:
            break
    else:
        count += 1
        continue
    break

print(count)