/*

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*/

/**

*

* @author Dell

*/

import java.io.*;

import java.util.*;

public class RansomNote {

public static String checkRansom(String[] magWord,String[] noteWord){

HashMap<String ,Integer> magazine = new HashMap<String , Integer>();

//inserting each word in the magazine map and along with its counter value in the string

for(String m : magWord){

if(magazine.containsKey(m)){

magazine.put(m,magazine.get(m) + 1);

}

else{

magazine.put(m, 1);

}

}

//looping over noteword array and finding if magazine contains that word or not

for(String n : noteWord){

//if not the we simply return a no.

if(!magazine.containsKey(n)){

return "No";

}

//if yes then we adjust counter to the frequecy of word - 1

int counter = magazine.get(n) - 1;

if(counter == 0){

magazine.remove(n);

}

// now we put back again that word along with its updated frequency into the array.

else{

magazine.put(n,counter);

}

}

return "Yes";

}

public static void main(String[] args) throws IOException{

// BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

Scanner sc = new Scanner(System.in);

int m = sc.nextInt();

int n = sc.nextInt();

String[] mag = new String[m];

String[] note = new String[n];

for(int i = 0 ; i < m ; i++){

mag[i] = sc.next();

}

for(int j = 0 ; j < n ; j++){

note[j] = sc.next();

}

String str = checkRansom(mag,note);

System.out.println(str);

}

}