#include <bits/stdc++.h>
using namespace std;

int main(void) {
	string S;
	cin >> S;
	
	int N = S.size(), ans = stoi(S);
	for(int i = 0; i < N; ++i) for(int j = i + 1; j < N; ++j) {
		swap(S[i], S[j]);
		ans = max(ans, stoi(S));
		swap(S[i], S[j]);
	}
	
	cout << ans << endl;
	return 0;
}