def hexagonalGrid(a, b):
    def explore(name, i):
        if name == 'a':
            if i < len(a) and a[i] == 0:
                a[i] = 1
                return 1 + explore('b', i) + explore('a', i+1)
        if name == 'b':
            if i < len(b) and b[i] == 0:
                b[i] = 1
                return 1 + explore('a', i+1) + explore('b', i+1)
        return 0

    a = [int(i) for i in a]
    b = [int(i) for i in b]

    for i in range(len(a)):
        cnt = 0
        if a[i] == 0:
            cnt = explore('a', i)
        if b[i] == 0:
            cnt = explore('b', i)
        if cnt % 2 != 0:
            return "NO"

    return "YES"