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

int main()
{
    string S;
    cin >> S;
    int N = S.size();
    string A;
    string B;
    for (int i = 0; i < N; i++)
    {
        if ('a' <= S[i] && S[i] <= 'z')
        {
            A += S[i];
        }
        else
        {
            B += S[i];
        }
    }
    reverse(A.begin(), A.end());
    cout << A + B;
}