В чем проблема?
package com.javarush.task.task07.task0727;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
/*
Меняем функциональность
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
ArrayList<String> list = new ArrayList<String>();
while (true) {
String s = reader.readLine();
if (s.isEmpty()) break;
list.add(s);
}
ArrayList<String> listUpperCase = new ArrayList<String>();
for (int i = 0; i < list.size(); i++) {
String s = list.get(i);
listUpperCase.add(s.toUpperCase());
}
for (int i = 0; i < listUpperCase.size(); i++) {
String e = listUpperCase.get(i);
if (e.length()%2==0)
{
System.out.println(listUpperCase.get(i)+listUpperCase.get(i));
}
else
{
System.out.println(listUpperCase.get(i)+listUpperCase.get(i)+listUpperCase.get(i));
}
}
}
}