import java.util.Scanner;

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

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    	String befId = sc.next();
    	String aftId = sc.next();
    
     String modId = aftId.substring(0, aftId.length()-1);
   	/* modId.setLength(aftId.length()-1);*/
    
    if(befId.equals(modId)) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
}