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

D = (a - c) * (a - c) - 4 * (b - d)
if D < 0:
    print("No")
elif D == 0:
    print("Yes")
else:
    p = (a + c) / 2
    q = (b + d) / 2
    print(f"{p:.9f} {q:.9f}")