a, b, c, d = map(int, input().split())

if (a - c) ** 2 - 8 * (b - d) < 0:
    print("No")
elif (a - c) ** 2 - 8 * (b - d) == 0:
    print("Yes")
else:
    print((a + c) / 2, (b + d) / 2)