#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <functional>
#include <cmath>
#include <string>
#include <queue>
#include <map>
#include <bitset>
#include <set>
#include <stack>
#include <numeric>
#include <unordered_map>
#include <random>

using namespace std;

using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vd = vector<double>;
using vs = vector<string>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pdd = pair<double, double>;
using vpii = vector<pii>;
using vpll = vector<pll>;
using vpdd = vector<pdd>;
const int inf = (1 << 30) - 1;
const ll INF = 1LL << 60;
//const int MOD = 1000000007;
const int MOD = 998244353;

int main() {
	int n;
	cin >> n;
	string s = to_string(n);
	int len = s.length();

	for (int i = 0; i < len; i++) {
		char c = '0';
		for (int j = i + 1; j < len; j++) {
			c = max(c, s[j]);
		}
		if (c <= s[i]) continue;
		for (int j = len - 1; j >= i + 1; j--) {
			if (s[j] == c) {
				swap(s[i], s[j]);
				cout << s << endl;
				return 0;
			}
		}
	}
	cout << s << endl;

	return 0;
}