#include <iostream>
using namespace std;

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

    bool change = false;
    for (int i = 0; i < N.size() - 1; i++) {
        int pos, digit = N[i] - '0';
        for (int j = i + 1; j < N.size(); j++) {
            if (digit < N[j] - '0') {
                change = true;
                digit = N[j] - '0';
                pos = j;
            } else if (digit == N[j] - '0') {
                pos = j;
            }
        }
        if (change) {
            swap(N[i], N[pos]);
            break;
        }
    }
    cout << N << endl;

    return 0;
}