gistfile1.h

#include <iostream>
using namespace std;

int x;
int tbl[10][10];
int ten[10];
int deg[10];

void dfs(int);

int main() {
	int m, n;
	while (cin >> m >> n) {
		if (m == n) {
			cout << m;
		}
		for (int i = 0; i < 10; i++) {
			ten[i] = 0;
			deg[i] = 0;	
			for (int j = 0; j < 10; j++) {
				tbl[i][j] = 0;
			}
		}
		for (int i = m; i <= n; i++) {
			if (i < 10) {
				ten[i] = 1;
			} else {	
				int a = i / 10;
				int b = i % 10;
				tbl[a][b] += 1;
				ten[a] = 0;
				ten[b] = 0;
				deg[a]++;
				deg[b]--;
			}
		}
		int max = 0, start = -1;
		for (int i = 0; i < 10; i++) {
			if (deg[i] > max) {
				start = i;
				max = deg[i];
			}
		}
		x = start;
		dfs(start);
		for (int i = 1; i < 10; i++) {
			if (ten[i] == 1) {
				cout << i;
			}
		}
		cout << endl;
	}
	return 0;
}

void dfs(int s) {
	if (s == -1) {
		return;
	} else {
		cout << s;
		x = s;
		int flag = 1, max = 0, i = -1;
		for (int d = 30; d >= -30; d--) {
			for (int i = 0; i < 10; i++) {
				if (tbl[s][i] > 0 && deg[i] == d) {
					tbl[s][i]--;
					deg[s]++;
					deg[i]--;
					flag = 0;
					if (s != x) {
						cout << s;
					}
					d = 30;
					dfs(i);
				}
			}
		}
	}
}