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

int main()
{
    string N;
    cin >> N;
    int Max_number = 0;
    int N_N = N.size();
    for (int i = 0; i < N_N; i++)
    {
        Max_number = max(Max_number, N[i] - '0');
    }
    int swap_i = 0;
    for (int i = 0; i < N_N; i++)
    {
        if (N[i] != Max_number)
        {
            swap_i = i;
            break;
        }
    }
    for (int i = N_N - 1; i >= 0; i--)
    {
        if (N[i] - '0' == Max_number)
        {
            swap(N[swap_i], N[i]);
            cout << N;
            return 0;
        }
    }
}