import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner scanner =new Scanner(System.in);
		String line1 = scanner.nextLine();
		String line2 = scanner.nextLine();
		scanner.close();
		String diff = line2.substring(0, line2.length() - 1);
		if (line1.equals(diff)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} import java.util.*; util.* java public class Main {

	public static void main(String[] args) {
		Scanner scanner =new Scanner(System.in);
		String line1 = scanner.nextLine();
		String line2 = scanner.nextLine();
		scanner.close();
		String diff = line2.substring(0, line2.length() - 1);
		if (line1.equals(diff)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} Main public static void main(String[] args) {
		Scanner scanner =new Scanner(System.in);
		String line1 = scanner.nextLine();
		String line2 = scanner.nextLine();
		scanner.close();
		String diff = line2.substring(0, line2.length() - 1);
		if (line1.equals(diff)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	} main {
		Scanner scanner =new Scanner(System.in);
		String line1 = scanner.nextLine();
		String line2 = scanner.nextLine();
		scanner.close();
		String diff = line2.substring(0, line2.length() - 1);
		if (line1.equals(diff)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	} Scanner scanner =new Scanner(System.in); scanner new Scanner(System.in) String line1 = scanner.nextLine(); line1 scanner.nextLine() scanner.nextLine scanner String line2 = scanner.nextLine(); line2 scanner.nextLine() scanner.nextLine scanner scanner.close() scanner.close scanner String diff = line2.substring(0, line2.length() - 1); diff line2.substring(0, line2.length() - 1) line2.substring line2 0 line2.length() - 1 line2.length() line2.length line2 1 if (line1.equals(diff)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		} line1.equals(diff) line1.equals line1 diff {
			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 scanner =new Scanner(System.in);
		String line1 = scanner.nextLine();
		String line2 = scanner.nextLine();
		scanner.close();
		String diff = line2.substring(0, line2.length() - 1);
		if (line1.equals(diff)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} public class Main {

	public static void main(String[] args) {
		Scanner scanner =new Scanner(System.in);
		String line1 = scanner.nextLine();
		String line2 = scanner.nextLine();
		scanner.close();
		String diff = line2.substring(0, line2.length() - 1);
		if (line1.equals(diff)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
} Main
import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner scanner =new Scanner(System.in);
		String line1 = scanner.nextLine();
		String line2 = scanner.nextLine();
		scanner.close();
		String diff = line2.substring(0, line2.length() - 1);
		if (line1.equals(diff)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}
