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

    D = (a - c) ** 2 - 4 * 2 * (b - d)
    if D < 0:
        print("No")
    elif D == 0:
        print("Yes")
    else:
        print((a+c)/2, (b+d)/2)
    

if __name__ == "__main__":
    main()