#include <iostream>
using namespace std;
int q[100];
int main()
{
	int a,b,l = 0;
	cin >> a >> b;
	for (int i = a; i <= b; ++i) {
		int t = i,c = 0;
		bool f = 1;
		for (int j = 0; j < 10; ++j) q[j] = 0;
		while (t) {
			q[t % 10]++;
			++c;
			t /= 10;
		}
		for (int i = 0; i < c; ++i) {
			if (q[i] != 1) {
				f = 0;
				break;
			}
		}
		if (f) ++l;
	}
	cout << l;
	return 0;	
}