#include<bits/stdc++.h>
using namespace std;
int a,b,t[10],ans = 0;
bool is(int i){
	memset(t,0,sizeof(t));
	int n = 0;
	while(i){
		t[i % 10]++;
		n++;i /= 10;
	}
	for(int i = 0;i < n;i++)
		if(!t[i]) return false;
	return true;
}
int main(){
	cin >> a >> b;
	for(int i = a;i <= b;i++)
		if(is(i)) ans++;
	cout << ans << endl;
	return 0;
}