#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 start = 0;
	int endidx = -1;
	while (start < S.length()) {
		while (S[start] == '9') {
			start++;
			if (start == S.length() - 2) {
				cout << S << endl;
				return 0;
			}
		}
		int i = start + 1;
		int endnum = S[start];
		while (i < S.length()) {
			if (endnum <= S[i]) {
				endnum = S[i];
				endidx = i;
			}
			i++;
		}
		if (endidx == -1) {
			cout << S << endl;
			return 0;
		}
		if (S[endidx] != S[start])  break;
		start++;
	}
	//cout << start << " " << endidx << endl;
	swap(S[endidx], S[start]);
	cout << S << endl;


    return 0;
}