LETTERS = [str(i) for i in range(34)]

sequence = input()
messages = [None] * (len(sequence) + 5)
messages[0] = 1
messages[1] = 2 if sequence[:2] in LETTERS else 1
for i in range(2, len(sequence)):
    if sequence[i - 1:i + 1] in LETTERS:
        messages[i] = messages[i - 1] + messages[i - 2]
    else:
        messages[i] = messages[i - 1]
print(messages[len(sequence) - 1])