#include "bits/stdc++.h"

#define debug(x) cout<<#x<<": "<<x<<endl
#define rep(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for (int i=(a);i<=(b);i++)
#define all(a) (a).begin(),(a).end()
using namespace std;
typedef vector<int> VI;
typedef vector<vector<int>> VVI;
typedef long long ll;


void solve() {
#ifdef _WIN32
	istream &cin = ifstream("input.txt");
#endif

	string x;
	cin >> x;

	char c = '0'; int j = 0;
	rep(i, x.size()) {
		if (c <= x[i]) {
			c = x[i];
			j = i;
		}
	}
	int k = 0;
	while (x[k] == x[j]) k++;
	if (k != x.size()) {
		char tmp = x[j];
		x[j] = x[k];
		x[k] = tmp;
	}
	cout << x << endl;
}




int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	solve();
	system("PAUSE");
	return 0;
}