Code

h1 = int(input())
w1 = int(input())
h2 = int(input())
w2 = int(input())

def is_same_colour(h1, w1, h2, w2):
    if ((h1 + w1) % 2) == ((h2 + w2) % 2):
        print('YES')
    else:
        print('NO')

is_same_colour(h1, w1, h2, w2)