It is already working. I used the help option to check the right answer. But I still didn't understand why we needed to use for loop twice and how we compared the String according to its number of letters??? Can anyone explain please with the most easiest language as you can. I feel like dumb.

package com.codegym.task.task07.task0708;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

/*
Longest string

*/

public class Solution {
      private static List<String> strings;

    public static void main(String[] args) throws Exception {

    	strings = new ArrayList<>();

    	 BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
         int longestString = 0;

         for (int i = 0; i < 5; i++) {
             strings.add(reader.readLine());
         }

         for (int i = 0; i < strings.size(); i++) {
             if (strings.get(i).length() > longestString)
                 longestString = strings.get(i).length();
         }

         for (int i = 0; i < strings.size(); i++) {
             if (strings.get(i).length() == longestString)
                 System.out.println(strings.get(i));
         }
     }
 }