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

int m[10];

bool f(int x)
{
	memset(m, 0, sizeof(m));
	int l = 0;
	int k = x;
	while(k)
	{
		m[k % 10]++;
		k /= 10;
		l++;
	}
	bool p = true;
	for (int i = 0; i < l; i++)
	{
		if (m[i] != 1)
		{
			p = false;
		}
	}
	return p;
}
int main()
{
	int a, b;
	cin >> a >> b;
	int ans = 0;
	for (int i = a; i <= b; i++)
	{
		if(f(i))
		{
			cout << i << endl;
			ans++;
		}
	}
	cout << ans << endl;
	return 0;
}