#include <bits/stdc++.h>

using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()

template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }

typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> P;

const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS  = 1e-10;

ll to_ll(string str) {
	stringstream ss(str);
	ll res;
	ss >> res;
	
	return res;
}

int main() {
	string n;
	cin >> n;
	
	ll ans = to_ll(n);
	REP(i, n.size()) FOR(j, i + 1, n.size()) {
		swap(n[i], n[j]);
		chmax(ans, to_ll(n));
		swap(n[i], n[j]);
	}
	
	cout << ans << endl;
	
	return 0;
}