#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n; i >= 0; i--)
#define FOR(i, m, n) for(int i = m; i < n; i++)
#define INF 2e9
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int a, b;
    cin >> a >> b;

    string ans = "YES";
    int remain = 0;

    if(a+1 > b)
    {
        ans = "NO";
        remain = (a + 1) - b;
    }

    cout << ans << endl;
    cout << remain << endl;

}