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

int l, r, ans;

bool check(int x)
{
	int d[15], cnt = 0;
	for (int i = 0; i <= 9; ++i)
		d[i] = 0;
	while (x > 0)
		++d[x % 10], ++cnt, x /= 10;
	for (int i = 0; i < cnt; ++i)
		if (d[i] != 1)
			return 0;
	return 1;
}

int main()
{
	scanf("%d%d", &l, &r);
	for (int i = l; i <= r; ++i)
		ans += check(i);
	printf("%d\n", ans);
	return 0;
}