#include<stdio.h>
int main()
{
    int m,w,remain,i;
    scanf("%d %d",&m,&w);
    remain=m+1;
    while(1){
        remain--;
        w--;
        if((m<0)||(w<0)){
            break;
        }
    }
    if(remain!=0){
        printf("NO\n");
        printf("%d\n",remain);
    }else{
        printf("YES\n");
        printf("%d\n",remain);
    }
    return 0;
}