#include<bits/stdc++.h>
using namespace std;
int wei(int n) {
	int cnt = 0;
	while(n) {
		cnt++;
		n /= 10;
	}
	return cnt;
}
int main() {
	int a, b, cnt = 0;
	cin >> a >> b;
	for(int i = a; i <= b; i++) {
		int l = wei(i), t = i;
		string s, s1;
		for(int j = 0; j < l; j++) s += '0' + j;
		while(t) {
			s1 += '0' + t % 10;
			t /= 10;
		}
		sort(s1.begin(), s1.end());
		if(s == s1) cnt++;
	}
	cout << cnt;
	return 0;
}