import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		String a = sc.next();
		StringBuilder b = new StringBuilder(sc.next());
		String r = b.deleteCharAt(b.length()-1).toString();

		if (a.equals(r)) {
			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 a = sc.next();
		StringBuilder b = new StringBuilder(sc.next());
		String r = b.deleteCharAt(b.length()-1).toString();

		if (a.equals(r)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}

	}

} Main public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		String a = sc.next();
		StringBuilder b = new StringBuilder(sc.next());
		String r = b.deleteCharAt(b.length()-1).toString();

		if (a.equals(r)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}

	} main {

		Scanner sc = new Scanner(System.in);

		String a = sc.next();
		StringBuilder b = new StringBuilder(sc.next());
		String r = b.deleteCharAt(b.length()-1).toString();

		if (a.equals(r)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String a = sc.next(); a sc.next() sc.next sc StringBuilder b = new StringBuilder(sc.next()); b new StringBuilder(sc.next()) String r = b.deleteCharAt(b.length()-1).toString(); r b.deleteCharAt(b.length()-1).toString() b.deleteCharAt(b.length()-1).toString b.deleteCharAt(b.length()-1) b.deleteCharAt b b.length()-1 b.length() b.length b 1 if (a.equals(r)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		} a.equals(r) a.equals a r {
			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 a = sc.next();
		StringBuilder b = new StringBuilder(sc.next());
		String r = b.deleteCharAt(b.length()-1).toString();

		if (a.equals(r)) {
			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 a = sc.next();
		StringBuilder b = new StringBuilder(sc.next());
		String r = b.deleteCharAt(b.length()-1).toString();

		if (a.equals(r)) {
			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 a = sc.next();
		StringBuilder b = new StringBuilder(sc.next());
		String r = b.deleteCharAt(b.length()-1).toString();

		if (a.equals(r)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}

	}

}
