#include <iostream>

using namespace std;

int main() {
    string s;
    cin >> s;

    int ret = stoi(s);
    for (int i = 0; i < s.size(); i++) {
        for (int j = i + 1; j < s.size(); j++) {
            swap(s[i], s[j]);
            ret = max(ret, stoi(s));
            swap(s[i], s[j]);
        }
    }

    cout << ret << endl;
    return 0;
}