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