a,b =  (int(x) for x in input().split())

if a<b:
    if a+1==b:
        print("YES")
        print(0)
    else:
        print("YES")
        print(b-(a+1))

if a>b:
    print("NO")
    print(a-b+1)

if a==b:
    print("NO")
    print(1)