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

typedef long long Int;
#define REP(i,n) for(int (i)=0;(i)<(int)(n);++(i))

int main() {
	string s;
	cin >> s;
	int n = s.size();
	int ans = stoi(s);
	for (int i = 0; i < n; i++) {
		for (int j = i + 1; j < n; j++) {
			swap(s[i], s[j]);
			int x = stoi(s);
			ans = max(ans, x);
			swap(s[i], s[j]);
		}
	}
	cout << ans << endl;

}