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

# 判別式
# 2x^2 + (a - c)x + (b - d) = 0
# D = (a - c)^2 - 4 * 2 * (b - d)
D = (a - c) ** 2 - 4 * 2 * (b - d)
if D < 0:
    print('No')
elif D == 0:
    print('Yes')
else:
    # y = px + q
    # 2y = (a + c)x + (b + d)
    p = (a + c) / 2
    q = (b + d) / 2
    print(p, q)