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

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false); 
    
    string a;
    cin>>a;
    int n = a.size();
    for(int i = n;i<=2*n;i++){
        string now = a;
        for(int j = n + 1;j<=i;j++){
            int ni = i - j;
            now.push_back(now[ni]);
        }
        auto nxt = now;
        reverse(nxt.begin(),nxt.end());
        if(now==nxt){
            cout<<now<<endl;
            return 0;
        }
    }
}