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