#include<stdio.h>

int main(){
    int a,b;
    scanf("%d%d",&a,&b);
    if(a<b){
        printf("YES\n");
        printf("%d",b-a-1);
    }else if(a==b){
        printf("NO\n%d\n",1);

    }else if(a>b){
        printf("NO\n%d\n",a-b+1);
    }
    return 0;
}