class Problem0780:
    def solve(this):
        a,b = map(int, input().split())
        res = a + 1 - b
        if res == 0:
            print("YES")
        else:
            print("NO")
            res = abs(res)
        print(res)

if __name__ == "__main__":
    problem = Problem0780()
    problem.solve()