#include "stdio.h"
int main()
{
  int a,b,sum1=0,sum2=0,i=0,j=1;
  scanf("%d %d",&a,&b);
  while(a<=b)
  { while(a)
    {
        if(j==1) 
        {
            sum1+=a%10;
            j=0;
            a/=10;
        }
        else
        {
            sum2+=a%10;
            j=1;
            a/=10;
        }
    }
     if(sum1==sum2)
      i++;
     a++;
  }
  printf("%d",i);
  return 0;
}