s = input().strip()
n = len(s)
used = [False] * n
target = ['K', 'U', 'R', 'O', 'I']
count = 0

while True:
    ptr = 0
    indices = []
    for c in target:
        found = False
        while ptr < n:
            if not used[ptr] and (s[ptr] == c or s[ptr] == '?'):
                indices.append(ptr)
                used[ptr] = True
                ptr += 1
                found = True
                break
            ptr += 1
        if not found:
            break
    if len(indices) == 5:
        count += 1
    else:
        break

print(count)