import java.util.Scanner;



public class Main {


	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		String str2 = sc.nextLine();
		String str3 = str2.substring(0, str2.length() - 1);
		if(str.equals(str3)) {
			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 str = sc.nextLine();
		String str2 = sc.nextLine();
		String str3 = str2.substring(0, str2.length() - 1);
		if(str.equals(str3)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		String str2 = sc.nextLine();
		String str3 = str2.substring(0, str2.length() - 1);
		if(str.equals(str3)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		String str2 = sc.nextLine();
		String str3 = str2.substring(0, str2.length() - 1);
		if(str.equals(str3)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String str = sc.nextLine(); str sc.nextLine() sc.nextLine sc String str2 = sc.nextLine(); str2 sc.nextLine() sc.nextLine sc String str3 = str2.substring(0, str2.length() - 1); str3 str2.substring(0, str2.length() - 1) str2.substring str2 0 str2.length() - 1 str2.length() str2.length str2 1 if(str.equals(str3)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		} str.equals(str3) str.equals str str3 {
			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 str = sc.nextLine();
		String str2 = sc.nextLine();
		String str3 = str2.substring(0, str2.length() - 1);
		if(str.equals(str3)) {
			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 str = sc.nextLine();
		String str2 = sc.nextLine();
		String str3 = str2.substring(0, str2.length() - 1);
		if(str.equals(str3)) {
			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 str = sc.nextLine();
		String str2 = sc.nextLine();
		String str3 = str2.substring(0, str2.length() - 1);
		if(str.equals(str3)) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
	}
}
