#include <bits/stdc++.h>
#define int long long
#define ull unsigned long long
#define mod 998244353
#define MOD 1000000007
using namespace std;
/*
template <typename T>
inline int into ()
{
	int s = 0,w = 1;
	char ch = getchar ();
	while (ch < '0' || ch > '9')
	{
		if (ch == '-')
			w = -1;
		ch = getchar ();
	}
	while (ch >= '0' && ch <= '9')
		s = s * 10 + ch - '0',
		ch = getchar ();
    return s * w;
}
*/
const int N = 1e5 + 5;

int a [N];

signed main () {
	ios :: sync_with_stdio (false);
	cin.tie (0),cout.tie (0);
	int a,b;
	cin >> a >> b;
	int ans = 0;
	for (int i = a;i <= b;i ++)
	{
		int flag = 1;
		int t = i;
		int c = 0;
		int x = 0;
		while (t)
		{
			x = t % 10;
			if (c >= x)
			{
				flag = 0;
				break;
			}
			c = x;
			t /= 10;
		}
		if (flag) ans ++;
	}
	cout << ans;
	return 0;
}