**Solution Java : **

class Solution{
	public static void main(String []argh)
	{
		Scanner in = new Scanner(System.in);
		int n=in.nextInt();
		in.nextLine();
        Map<String, Integer> mp = new HashMap<String,Integer>();
        
		for(int i=0;i<n;i++)
		{
			String name=in.nextLine(); 
			int phone =in.nextInt();
            in.nextLine();
            mp.put(name,phone);
		}
        
        
		while(in.hasNext())
		{
			String s = in.nextLine();
        
            if(mp.containsKey(s)){
                String value =mp.get(s).toString();
                System.out.println(s+ "=" +value);
                
            }else{
                
                System.out.println("Not found");
            }
		}
	}
}

class Solution{ public static void main(String []argh) { Scanner in = new Scanner(System.in); Map phoneMap = new HashMap<>(); int n=in.nextInt(); in.nextLine(); for(int i=0;i

Super simple and self explainatory solution:

import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        int rows = in.nextInt();
        in.nextLine();
        Map<String, String> contacts = new HashMap<>();
        
        for(int i = 0; i < rows; i++) {
            String name = in.nextLine();
            String number = in.nextLine();
            contacts.put(name, number);
        }
        
        while(in.hasNext()) {
            String name = in.nextLine();
            
            if (contacts.get(name) == null) {
                System.out.println("Not found");
            } else {
                System.out.println(String.format("%s=%s", name, contacts.get(name)));
            }
        }
    }
}

//Complete this code or write your own from scratch import java.util.; import java.io.;

class Solution{ public static void main(String []argh) { Scanner in = new Scanner(System.in); int n=in.nextInt(); in.nextLine(); HashMap map = new HashMap<>();

    for(int i=0;i<n;i++)
    {
        String name=in.nextLine();
        int phone=in.nextInt();
        in.nextLine();
        map.put(name, phone);
    }
    while(in.hasNext())
    {
        String s=in.nextLine();
        if(map.get(s)!=null){
        System.out.println(s+"="+map.get(s));
        }else{
            System.out.println("Not found");
        }

    }

}

}

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

public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int n = scanner.nextInt(); scanner.nextLine();

    HashMap<String, String> phoneBook = new HashMap<>();

    // Read n phone book entries
    for (int i = 0; i < n; i++) {
        String name = scanner.nextLine();
        String phoneNumber = scanner.nextLine();
        phoneBook.put(name, phoneNumber);
    }

    // Look up phone numbers for m queries
    while (scanner.hasNext()) {
        String name = scanner.nextLine();
        String phoneNumber = phoneBook.get(name);
        if (phoneNumber != null) {
            System.out.println(name + "=" + phoneNumber);
        } else {
            System.out.println("Not found");
        }
    }

    scanner.close();
}

}