#include <bits/stdc++.h>
using namespace std;
#define pb push_back
using ll = long long;
using vi = vector <int>;
const ll mod = 1e9 + 7;


int main() {
	ios::sync_with_stdio(0);
	
	string s; cin >> s;
	int n = s.size();
	
	for(int i = 0; i < n; i ++) {
		string t = s.substr(0, i);
		reverse(t.begin(), t.end());
		t = s + t;
		
		string r = t;
		reverse(r.begin(), r.end());
		if(r == t) {
			cout << t << '\n';
			break;
		}
	}
}