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

int main()
{
	string a;
	cin >> a;
	
	int n = (int)a.size();
	bool pos1, pos2;
	for(int i = (n + 1) / 2; i <= n; i++)
	{
		string c1, c2;
		pos1 = true;
		pos2 = true;
		for(int j = 0; j < i; j++)
		{
			c1 += a[j];
			c2 += a[j];
		}
		for(int j = i - 1; j >= 0; j--)
		{
			c1 += a[j];
			if(j != i - 1) c2 += a[j];
		}
		
		for(int j = 0; j < n; j++)
		{
			if(c1[j] != a[j])
			{
				pos1 = false;
				break;
			}
		}
		if((int)c2.size() < n) pos2 = false;
		if(pos2)
		{
			for(int j = 0; j < n; j++)
			{
				if(c2[j] != a[j])
				{
					pos2 = false;
					break;
					
				}
			}
		}
		
		if(pos1 || pos2)
		{
			if(pos2) cout << c2 << endl;
			else cout << c1 << endl;
			return 0;
		}
	}
}