#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vi  = vector<int>; using vb  = vector<bool>; using vd  = vector<double>; using vl  = vector<ll>;
using vvi = vector<vi>;  using vvb = vector<vb>;   using vvd = vector<vd>;     using vvl = vector<vl>;

#define REP(i,n) for(ll i=0; i<(n); ++i)

int main() {
	string s; cin >> s;
	ll max_v = 0;
	REP(i, s.size()) REP(j, s.size()) {
		swap(s[i], s[j]);
		max_v = max<ll>(max_v, stoi(s));
		swap(s[i], s[j]);
	}

	cout << max_v << endl;

	return 0;
}