import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
      	Scanner sc = new Scanner(System.in);
     	String s = sc.nextLine();
      	String t = sc.nextLine();
        String t2 = t.substring(0, s.length());
        if(s.equals(t2)) System.out.println("Yes");
        else System.out.println("No");
    }
  
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
      	Scanner sc = new Scanner(System.in);
     	String s = sc.nextLine();
      	String t = sc.nextLine();
        String t2 = t.substring(0, s.length());
        if(s.equals(t2)) System.out.println("Yes");
        else System.out.println("No");
    }
  
} Main public static void main(String[] args) throws Exception {
      	Scanner sc = new Scanner(System.in);
     	String s = sc.nextLine();
      	String t = sc.nextLine();
        String t2 = t.substring(0, s.length());
        if(s.equals(t2)) 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 t2 = t.substring(0, s.length());
        if(s.equals(t2)) 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 t2 = t.substring(0, s.length()); t2 t.substring(0, s.length()) t.substring t 0 s.length() s.length s if(s.equals(t2)) System.out.println("Yes");
        else System.out.println("No"); s.equals(t2) s.equals s t2 System.out.println("Yes") System.out.println System.out System System.out "Yes" 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) throws Exception {
      	Scanner sc = new Scanner(System.in);
     	String s = sc.nextLine();
      	String t = sc.nextLine();
        String t2 = t.substring(0, s.length());
        if(s.equals(t2)) System.out.println("Yes");
        else System.out.println("No");
    }
  
} public class Main {
    public static void main(String[] args) throws Exception {
      	Scanner sc = new Scanner(System.in);
     	String s = sc.nextLine();
      	String t = sc.nextLine();
        String t2 = t.substring(0, s.length());
        if(s.equals(t2)) System.out.println("Yes");
        else System.out.println("No");
    }
  
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
      	Scanner sc = new Scanner(System.in);
     	String s = sc.nextLine();
      	String t = sc.nextLine();
        String t2 = t.substring(0, s.length());
        if(s.equals(t2)) System.out.println("Yes");
        else System.out.println("No");
    }
  
}
