/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner in = new Scanner(System.in);
 
		String s1 = in.nextLine();
		String s2 = new String();
 
		if(s1.length()<4){
			System.out.println("Невозможно выполнить операцию.");
		} else {
			s2=s1.substring(0, s1.length()-1);
			s2+=s1.charAt(0);
			s2+=s1.charAt(1);
			s2+=s1.charAt(s1.length()-1);
		}
		System.out.println(s2);
	}
}

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