#include<stdio.h>

int main(void){
    
    int A,B;
    scanf("%d%d",&A,&B);
    
    if(A==B)
        printf("NO\n1\n");
    if(A<B)
        printf("YES\n%d\n",B-A-1);
    if(A>B)
        printf("NO\n%d\n",A+1-B);
    
    return 0;
    
    
}