fizzbuzz = {}
for i in range(1,31):
    if i % 3 == 0:
        if i in fizzbuzz:
            fizzbuzz[i] += 'Fizz'
        else:
            fizzbuzz[i]  = 'Fizz'
    if i % 5 == 0:
        if i in fizzbuzz:
            fizzbuzz[i] += 'Buzz'
        else:
            fizzbuzz[i]  = 'Buzz'
print(len(fizzbuzz))
for k,v in fizzbuzz.items():
    print(v)