#include <iostream>
using namespace std;

int f(int num) {
	
	int a[10] = {0};
	int x = 0;
	while(num) {
		a[num%10]++;
		num /= 10;
		x++;
	}
	for (int i = 0; i < x; i++) {
		if (a[i] == 0) {
			return 0;
		}
	} 
	return 1;
}
int main() {
	
	
	int n, m;
	cin >>n >> m;
	int cnt = 0;
	for (int j = n; j <= m; j++) {
		if (f(j)) {
			cnt++;
		}
	}
	cout << cnt; 
	
	return 0;
}