import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        char[] inputs = sc.next().toCharArray();
        for (int i = 0; i < inputs.length; i++) {
            boolean enable = true;
            char[] ans = new char[inputs.length + i];
            int left = 0;
            int right = inputs.length - 1 + i;
            while (left <= right && enable) {
                enable = right >= inputs.length || inputs[left] == inputs[right];
                ans[left] = inputs[left];
                ans[right] = inputs[left];
                left++;
                right--;
            }
            if (enable) {
                System.out.println(ans);
                return;
            }
        }
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}