#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
bool is_palindrome(string S) {
	for( int i = 0, j = S.length()-1; i < j; i++, j-- ) {
		if( S[i] != S[j] ) {
			return false;
		}
	}
	return true;
}
int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	string A;
	cin >> A;
	int N = A.length();
	for( int i = 0; i <= N; i++ ) {
		string B = A.substr(0, i);
		reverse(B.begin(), B.end());
		if( is_palindrome(A+B) ) {
			cout << A+B << endl;
			return 0;
		}
	}
}