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

public class Solution {
  Map<String, Integer> magazineMap;
  Map<String, Integer> noteMap;

  public Solution(String magazine, String note) {
    this.noteMap = new HashMap<String, Integer>();
    this.magazineMap = new HashMap<String, Integer>();

    // Must use an object instead of a primitive because it may be assigned a null reference.
    Integer occurrences;

    for (String s : magazine.split("[^a-zA-Z]+")) {
      occurrences = magazineMap.get(s);

      if (occurrences == null) {
        magazineMap.put(s, 1);
      } else {
        magazineMap.put(s, occurrences + 1);
      }
    }

    for (String s : note.split("[^a-zA-Z]+")) {
      occurrences = noteMap.get(s);

      if (occurrences == null) {
        noteMap.put(s, 1);
      } else {
        noteMap.put(s, occurrences + 1);
      }
    }

  }

  public void solve() {
    boolean canReplicate = true;
    for (String s : noteMap.keySet()) {
      if (!magazineMap.containsKey(s) || (magazineMap.get(s) < noteMap.get(s))) {
        canReplicate = false;
        break;
      }
    }

    System.out.println((canReplicate) ? "Yes" : "No");
  }

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

    // Eat whitespace to beginning of next line
    scanner.nextLine();

    Solution s = new Solution(scanner.nextLine(), scanner.nextLine());
    scanner.close();

    s.solve();
  }
}