---

with open('24.txt') as f:
    s = f.readline().strip()

order = "VWXYZ"
max_len = 0

i = 0
while i < len(s):
    j = i
    length = 0
    full_groups = 0
    
    # определяем стартовую позицию в шаблоне
    if s[j] in order:
        pos = order.index(s[j])
    else:
        i += 1
        continue
    
    while j < len(s) and s[j] in order:
        if s[j] == order[pos]:
            length += 1
            pos += 1
            
            if pos == 5:
                pos = 0
                full_groups += 1
        else:
            break
        j += 1
    
    if full_groups > 0:
        max_len = max(max_len, length)
    
    i += 1

print(max_len)