#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
using namespace std;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;

i64 GCD(i64 a, i64 b){ return b ? GCD(b,a%b) : a; }

using Modint = atcoder::static_modint<998244353>;


int main(){
    string A; cin >> A;
    string res = A + A;
    int N = A.size();
    for(int i=N-1; i>=0; i--){
        string P = A.substr(0, i);
        reverse(P.begin(), P.end());
        P = A + P;
        string rP = P; reverse(P.begin(), P.end());
        if(rP == P) res = P;
    }
    cout << res << endl;
    return 0;
}



struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;