Input Format
The first line contains an integer, , total number of rows in the table.
Each of the  subsequent lines contains  space-separated strings denoting a person's first name and email ID, respectively.
Constraints
• Each of the first names consists of lower case letters  only.
• Each of the email IDs consists of lower case letters  and  only.
• The length of the first name is no longer than 20.
• The length of the email ID is no longer than 50.
Output Format
Print an alphabetically-ordered list of first names for every user with a gmail account. Each name must be printed on a new line.

### Problem solution in Java programming language.

import java.io.*;
import java.util.*;
import java.lang.*;
import java.util.regex.*;

class Email{
public String name;
public String email;

public Email(String name, String email){
this.name = name;
this.email = email;
}
}

public class Solution {
// Simulate the Emails table
static List<Email> emailList;

public static List<String> getGmailUsers(){
List<String> names = new ArrayList<String>();
Pattern p = Pattern.compile(".*@gmail.com");

for(Email e : emailList){
if(p.matcher(e.email).matches()){
}
}
Collections.sort(names);
return names;
}

public static void main(String[] args) {
Scanner in = new Scanner(System.in);
emailList  = new ArrayList<Email>();
int n = in.nextInt();
for(int i = 0; i < n; i++){
}
in.close();

for(String name : getGmailUsers()){
System.out.println(name);
}
}
}

#### Second solution

import java.util.*;

public class Solution {

public static void main(String[] args) {
Scanner in = new Scanner(System.in);
List<String> nameList  = new ArrayList<String>();

int n = in.nextInt();
for(int i = 0; i < n; i++){
String name = in.next();
String[] email = in.next().split("@");
if(email[1].equals("gmail.com")){
}
}
in.close();
Collections.sort(nameList);

for(String name : nameList){
System.out.println(name);
}
}
}

### Program solution in Python programming language.

#!/bin/python3

import math
import os
import random
import re
import sys

if __name__ == '__main__':
N = int(input())
nw = []

for N_itr in range(N):
firstNameEmailID = input().split()

firstName = firstNameEmailID[0]

emailID = firstNameEmailID[1]
if '@gmail.com' in emailID:
nw.append(firstName)

nw = sorted(nw)
for item in nw:
print(item)