import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String T = sc.next();
        if (T.startsWith(S)){
          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 S = sc.next();
        String T = sc.next();
        if (T.startsWith(S)){
          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.next();
        String T = sc.next();
        if (T.startsWith(S)){
          System.out.println("Yes");
        }else {
          System.out.println("No");
        }
    } main {
		Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String T = sc.next();
        if (T.startsWith(S)){
          System.out.println("Yes");
        }else {
          System.out.println("No");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc String T = sc.next(); T sc.next() sc.next sc if (T.startsWith(S)){
          System.out.println("Yes");
        }else {
          System.out.println("No");
        } T.startsWith(S) T.startsWith T S {
          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.next();
        String T = sc.next();
        if (T.startsWith(S)){
          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.next();
        String T = sc.next();
        if (T.startsWith(S)){
          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 S = sc.next();
        String T = sc.next();
        if (T.startsWith(S)){
          System.out.println("Yes");
        }else {
          System.out.println("No");
        }
    }
}