import java.util.*;

public class Main {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);
    
    int a = sc.nextInt();
    int b = sc.nextInt();
    int n = 0;
    
    for (int i = 0; i < (b - a + 1); i++) {
      String s[] = String.valueOf(a + i).split("");
      String t = s[4] + s[3] + s[2] + s[1] + s[0];
      
      if (String.valueOf(a + i).equals(t)) n++;
    }
    
    System.out.println(n);
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz