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

D = (a-c)*(a-c) - 4 * 2 * (b - d)

if D < 0:
    print("No")
elif D == 0:
    print("Yes")
else:
    p = (a+c) / 2
    q = (b+d) / 2
    print(p, q, sep=" ")