#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001


int main(){
	
	string a;
	cin>>a;
	
	rep(i,a.size()+1){
		string s = a;
		string t = "";
		rep(j,i)t += a[j];
		reverse(t.begin(),t.end());
		s += t;
		t = string(s.rbegin(),s.rend());
		if(s==t){
			cout<<s<<endl;return 0;
		}
	}
	
	return 0;
}