#include <bits/stdc++.h>
#define int long long
#define ll long long
#define rep(i,n) for(int i=0;i<n;i++)
#define INF LLONG_MAX/3
#define eps LDBL_EPSILON
#define moder (1000000007)
#define pie acos(-1)
#define P std::pair<int,int>
#define prique priority_queue
#define ggr getchar();getchar();return 0;
using namespace std;
int a,b;
signed main(){
	cin>>a>>b;
	if(a<=b-1){
		puts("YES");
		cout<<b-1-a<<endl;
	}
	else{
		puts("NO");
		cout<<abs((a+1)-b)<<endl;
	}
	return 0;
}