#include <stdio.h>

#define YASUO 1

int main()
{
    int YARICHIN;
    int YARIMAN;
    
    scanf("%d %d",&YARICHIN,&YARIMAN);
    if(YARICHIN+YASUO<=YARIMAN){
        printf("YES\n");
        printf("%d\n",YARIMAN-(YARICHIN+YASUO));
    }else{
        printf("NO\n");
        printf("%d\n",(YARICHIN+YASUO)-YARIMAN);
    }
    
    return 0;
}