#include<stdio.h>

int main(void){
  int m_count, f_count, diff;
  char output[] = "NO";
  scanf("%d%d", &m_count, &f_count);
  m_count++;

  diff = m_count - f_count;
  if(diff < 0)
    diff *= -1;


  if(m_count <= f_count)
    printf("YES\n");
  else
    printf("NO\n");
  printf("%d", diff);

  return 0;
}