#include<bits/stdc++.h>
using namespace std;
long long n, m, sum;
bool cmp(int n){
	int a[1000] = {0}, t = 0,s = n;
	while(n != 0){
		a[n % 10] = 1;
		n /= 10;
		t ++;
	}
	if(s / pow(10, t - 1) == 0)
		return 0;
	for(int i = 0;i < t;i ++){
		if(a[i] == 0)
			return 0;
	}
	return 1;
}
int main(){
	cin >> n >> m;
	for(int i = n;i <= m;i ++){
		if(cmp(i))
			sum ++;
	}
	cout << sum;
	return 0;
}