import math

N = int(input())
r = 0
if N%2 == 0:
    r = N/2
else:
    r = N//2 + 1
findNum = False
top = 0
bottom = 0

for i in range(1, r):
    top = i
    bottom = N - i
    res1, _ = math.modf(math.log2(top))
    res2, _ = math.modf(math.log2(bottom))
    if res1 != 0 and res2 != 0:
        findNum = True
        break

if findNum:
    print(top, " ", bottom)
else:
    print("-1")