sumitsingh6

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Addrev {

    public static void main(String[] args)throws Exception {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

        int count = Integer.parseInt(in.readLine());

sumitsingh6

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
import java.util.Vector;

import static java.lang.Math.floor;
import static java.lang.Math.sqrt;

public class Prime {

sumitsingh6

//Given a string, return a new string where the first and last chars have been exchanged.

public String frontBack(String str) {
  int n=str.length();
  if(n>=2){
    return str.substring(n-1)+str.substring(1,n-1)+str.substring(0,1);
  }
else 
return str;