#include <bits/stdc++.h>
using namespace std;
int a, b;
bool check(int x){
	int xx = x, a[10] = {0}, cnt = 0, cntt = 0;
	while(x){
		a[x % 10]++;
		if(a[x % 10] == 1) cntt++;
		cnt++;
		x /= 10;
	} 
	for (int i = 0; i <= cnt - 1; i++) {
		if (a[i] == 0) return 0;
	}
	//cout << endl;
	return 1;
	
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	cin >> a >> b;
	int ans = 0;
	for (int i = a; i <= b; i++){
		if (check(i)) {
			
			ans++;
			//cout << i << endl;
		}
	}
	cout << ans;
	return 0;
}