import random

def to_letter(n):
    if n > 25:
        return chr(n-26+ord('A'))
    return chr(n+ord('a'))

n, k = 500000, 30

print(n, k)
for i in range(n):
    print(to_letter(random.randint(0, k-1)), end="")
print()
for i in range(n):
    print(to_letter(random.randint(0, k-1)), end="")
print()