#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define SZ(n) (int)(n).size()
#define ALL(n) (n).begin(), (n).end()
#define MOD 1000003
#define INF 100000000
using namespace std;
typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PI;


int main() {
	string n;
	cin >> n;
	int np[16];
	REP(i, SZ(n)) {
		np[i] = n[i];
	}
	int m[2] = {};
	REP(i, SZ(n)) {
		if (m[0] < np[i]) {
			m[0] = np[i];
			m[1] = i;
		}
		if (m[0] == np[i]) {
			m[1] = i;
		}
	}
	REP(i, SZ(n)) {
		if (np[i] < m[0] || np[i] == m[0]) {
			swap(np[m[1]], np[i]);
			break;
		}
	}
	REP(i, SZ(n)) {
		cout << char(np[i]);
	}
	cout << endl;
	return 0;
}