S = input().strip()
pattern = 'yukicoder'
pattern_length = len(pattern)
starts = []

start = 0
while True:
    pos = S.find(pattern, start)
    if pos == -1:
        break
    starts.append(pos)
    start = pos + pattern_length  # Move past the current occurrence

if not starts:
    print(0)
else:
    max_k = 1
    current_k = 1
    for i in range(1, len(starts)):
        if starts[i] == starts[i-1] + pattern_length:
            current_k += 1
            if current_k > max_k:
                max_k = current_k
        else:
            current_k = 1  # Reset for a new potential sequence
    print(max_k)