#include <bits/stdc++.h>
using namespace std;
int a, b, s = 0, q[8], l = 1;
int main (){
    scanf ("%d%d", &a, &b);
	for (int i = a;i <= b;i++){
        int j = 1000000;
		while (j != 0){
			q[l] = i / j % 10;
			l++;
		}	
	}
	for (int i = 1;i <= l;i++){
		bool f = false;
		for (int j = 1;j <= l;j++){
			if (i - 1 == q[j])
			    f = true;
		}
		if (f == false)
		    s++;
	}
	printf ("%d", s);	
	return 0;
}