6
DEVELOPER.@gmail.com
t+es+ter@GMAIL.COM
T@bmail.com
a@gmail.com.ru
D.eveloper@Gmail.Com
a+b@gmail.com.ru

5
1 a@gmail.com.ru
1 t+es+ter@GMAIL.COM
2 DEVELOPER.@gmail.com D.eveloper@Gmail.Com
1 a+b@gmail.com.ru
1 T@bmail.com

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Mails {

public static void main(String[] args) {
    Map<String, String> map = new HashMap<>();
    Scanner sc = new Scanner(System.in);
    int n = Integer.parseInt(sc.nextLine());
    for (int i = 0; i < n; i++) {
        String str1 = sc.nextLine();
        String str2 = str1.toLowerCase();
        String[] arr1 = str2.split("@");
        if (arr1[1].equals("gmail.com")) {
            str2 = arr1[0].replace(".", "") + "@gmail.com";
            if (str2.contains("+")) {
                String[] arr2 = str2.split("\+");
                str2 = arr2[0] + "@gmail.com";
            }
        }
        if (map.containsKey(str2)) {
            String value = map.get(str2);
            map.put(str2, value + " " + str1);
        }
        else {
            map.put(str2, str1);
        }
    }
    System.out.println(map.size());
    for (String value: map.values()) {
        int count = value.split(" ").length;
        System.out.println(count + " " + value);
    }
}
}