#include<bits/stdc++.h>
using namespace std;
#define int long long

int a, b, ans;
bool vst[15];
signed main(){
	cin >> a >> b;
	for(int i = a; i <= b; i++){
		int s = i, cnt = 0, maxn = 0;
		bool f = true;
		memset(vst, false, sizeof(vst));
		while(s){
			int num = s % 10;
			s /= 10;
			cnt++;
			maxn = max(maxn, num);
			if(vst[num]){
				f = false;
				break;
			}
			vst[num] = true;
		}
		if(f && maxn < cnt){
			ans++;
		}
	}
	cout << ans;
	return 0;
}