x, y = map(int, input().split())
pr = x * y
flag = False
for i in range(1, x + 1):
    for j in range(1, y + 1):
        if i % j != 0 and j % i != 0 and x ** 2 * i * j == pr:
            print(j * 2, i * 2)
            flag = True
            break
    if flag:
        break
if not flag:
    print(-1)