#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
#define all(x) (x).begin(), (x).end()
#define MOD 1000000007

int main() {
    int a, b;
    cin >> a >> b;
    if(a >= b) {
        cout << "NO" << endl;
        cout << a - b + 1 << endl;
        cout << endl;

    } else {
        cout << "YES" << endl;
        cout << 0 << endl;
        cout << endl;
    }
}