Solution.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Solution {
    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        int N = scanner.nextInt();
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        List<String> array = new ArrayList<>();

        for (int NItr = 0; NItr < N; NItr++) {
            String[] firstNameEmailID = scanner.nextLine().split(" ");

            String firstName = firstNameEmailID[0];

            String emailID = firstNameEmailID[1];

            if (emailID.contains("@gmail.com")){
                array.add(firstName);
            }
        }

        Collections.sort(array);

        for (String firstNames: array) {
            System.out.println(firstNames);
        }

        scanner.close();
    }
}