#include <iostream>
#include <vector>
#include <map>
#include <array>

using namespace std;
template<class T> int maxReturn(T a, T b) {if (a > b) {return a;} else {return b;}}
template<class T> int minReturn(T a, T b) {if (a < b) {return a;} else {return b;}}

int main(void){
    int A,B;
    cin >> A >> B;
    
    if (A < B) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl << (A + 1) - B << endl;
    }
}