#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 r;
    for (int i = N_N - 1; i >= 0; i--)
    {
        if (N[i] - '0' == Max_number)
        {
            r = i;
            break;
        }
    }
    for (int l = 0; l < N_N; l++)
    {
        if (N[l] - '0' != Max_number)
        {
            if (l < r)
            {
                swap(N[l], N[r]);
                break;
            }
        }
    }
    cout << N;
}