#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	string S; cin >> S;
	int i = 0;
	while (i < S.length()) {
		int j = i + 1;
		int Midx = -1;
		int Mnum = S[i] + 1;
		while (j < S.length()) {
			if (Mnum <= S[j]) {
				Midx = j;
				Mnum = S[j];
			}
			j++;
		}
		if (Midx != -1) {
			//cout << i << " " << Midx << endl;
			swap(S[i], S[Midx]);
			cout << S << endl;
			return 0;
		}
		i++;
	}
	cout << S << endl; return 0;


    return 0;
}