#include <bits/stdc++.h>
using namespace std;
bool check(int a){
	int a1 = a,lens = 0;
	bool sss[11] = {0,0,0,0,0,0,0,0,0,0,0};
	while(a1){
		lens++;
		sss[a1 % 10] = 1;
		a1 /= 10;
	}
	for(int i = 0;i < lens;i++){
		if(sss[i] == 0){
			return 0;
		}
	}
	return 1;
}
int main(){
	int n,m,cnt = 0;
	cin >> n >> m;
	for(int i = n;i <= m;i++){
		if(check(i) == 1){
			cnt++;
		}
	}
	cout << cnt;
	return 0;
}