#include<bits/stdc++.h>
using namespace std;
#define int long long
int a, b, ans;
bool fun(int x) {
	int a = 0, k = x;
	while (k != 0) {
		k /= 10;
		a++;
	}
	int b[a] = {1};
	for (int i = 0; i < a; i++) {
		int k = x, s = 0;
		while (k % 1 == 0) {
		int r = k % 10;
		k /= 10;
		if (r == i) break;
		s++;
		if (s > a - 1) return false;
		}	
	}
	return true;
}
signed main( ) {
	cin >> a >> b;
	for (int i = a; i <= b; i++) {
		if (fun(i)) ans++;
	}
	cout << ans;
	return 0;
}