#include "bits/stdc++.h"
using namespace std;
using Graph = vector<vector<int>>;
typedef long long ll;
typedef pair<int, int> P;
#define rep(i,n) for (ll i = 0; i < (n); ++i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
const long long mod = 1e9 + 7;

ll gcd(ll a, ll b) {
	return b ? gcd(b, a % b) : a;
}

ll lcm(ll a, ll b) {
	return a / gcd(a, b) * b;
}

int main() {
	ll a, b;
	cin >> a >> b;
	
	a++;
	ll n = a-b;
	
	if (n > 0) {
		cout << "NO" << endl;
		cout << n << endl;
	} else {
		cout << "YES" << endl;
		cout << 0 << endl;
	}

}