def solve():
    line = input().split(" ")
    male = int(line[0])
    female = int(line[1])
    remain = 0
    if (male + 1 > female):
        print("NO")
        remain = male + 1 - female
    elif (male + 1 == female):
        print("YES")
    else:
        print("YES")
        remain = female - (male + 1)

    print(remain)


solve()