#include <bits/stdc++.h>
typedef long long ll;
#define FOR(i,a,b) for(ll i=(a);i<(b);i++)
#define REP(i,a) FOR(i,0,a)
	
using namespace std;
int A,B;
int main(){
	cin>>A>>B;
	cout<<(A<B ? "YES" : "NO")<<endl<<(max(A-B+1,0))<<endl;
}