#include<iostream>
#include<string>
#include<math.h>
#include<stdlib.h>
#include<string>
#include<cstdio>
#include<stack>
using namespace std;
int main() {
	int a, b;
	cin >> a >> b;
	if (a + 1 <= b) {
		cout << "YES" << endl;
		cout << abs(a + 1 - b) << endl;
	}
	else {
		cout << "NO" << endl;
		cout << abs(a + 1 - b) << endl;
	}
}