import java.util.*;
 
public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.nextLine();
    String T = sc.nextLine();
    String t = T.substring(0, T.length()-1);

    if(S.equals(t)){
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} import java.util.*; util.* java public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.nextLine();
    String T = sc.nextLine();
    String t = T.substring(0, T.length()-1);

    if(S.equals(t)){
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.nextLine();
    String T = sc.nextLine();
    String t = T.substring(0, T.length()-1);

    if(S.equals(t)){
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  } main {
    Scanner sc = new Scanner(System.in);
    String S = sc.nextLine();
    String T = sc.nextLine();
    String t = T.substring(0, T.length()-1);

    if(S.equals(t)){
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.nextLine(); S sc.nextLine() sc.nextLine sc String T = sc.nextLine(); T sc.nextLine() sc.nextLine sc String t = T.substring(0, T.length()-1); t T.substring(0, T.length()-1) T.substring T 0 T.length()-1 T.length() T.length T 1 if(S.equals(t)){
      System.out.println("Yes");
    } else {
      System.out.println("No");
    } S.equals(t) S.equals S t {
      System.out.println("Yes");
    } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
      System.out.println("No");
    } System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.nextLine();
    String T = sc.nextLine();
    String t = T.substring(0, T.length()-1);

    if(S.equals(t)){
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.nextLine();
    String T = sc.nextLine();
    String t = T.substring(0, T.length()-1);

    if(S.equals(t)){
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} Main
import java.util.*;
 
public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.nextLine();
    String T = sc.nextLine();
    String t = T.substring(0, T.length()-1);

    if(S.equals(t)){
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
}