Maybe I'm misunderstanding the requirements, but I was confident that I had found a solution.
package com.codegym.task.task07.task0708;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
/*
Longest string
*/
public class Solution {
private static List<String> strings;
public static void main(String[] args) throws Exception {
//write your code here
Scanner input = new Scanner(System.in);
strings = new ArrayList<String>();
ArrayList<Integer> list2 = new ArrayList<Integer>();
for (int i = 0; i < 5; i++) {
strings.add(input.nextLine());
}
int longest = 0;
for (int i = 0; i < 5; i++) {
if (strings.get(i).length() > longest) {
list2.add(i);
longest = strings.get(i).length();
} else {
//do nothing
}
}
for (int i = 0; i <= list2.size(); i++) {
System.out.println(strings.get(i));
}
}
}