import java.util.Scanner;
public class Main{
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();
		String t = sc.nextLine();
		int sSize = s.length();

		String tMinus1 = t.substring(0, sSize);

		if (tMinus1.equals(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.nextLine();
		String t = sc.nextLine();
		int sSize = s.length();

		String tMinus1 = t.substring(0, sSize);

		if (tMinus1.equals(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.nextLine();
		String t = sc.nextLine();
		int sSize = s.length();

		String tMinus1 = t.substring(0, sSize);

		if (tMinus1.equals(s)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}


	} main {
		Scanner sc = new Scanner(System.in);
		String s = sc.nextLine();
		String t = sc.nextLine();
		int sSize = s.length();

		String tMinus1 = t.substring(0, sSize);

		if (tMinus1.equals(s)) {
			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 int sSize = s.length(); sSize s.length() s.length s String tMinus1 = t.substring(0, sSize); tMinus1 t.substring(0, sSize) t.substring t 0 sSize if (tMinus1.equals(s)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		} tMinus1.equals(s) tMinus1.equals tMinus1 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.nextLine();
		String t = sc.nextLine();
		int sSize = s.length();

		String tMinus1 = t.substring(0, sSize);

		if (tMinus1.equals(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.nextLine();
		String t = sc.nextLine();
		int sSize = s.length();

		String tMinus1 = t.substring(0, sSize);

		if (tMinus1.equals(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.nextLine();
		String t = sc.nextLine();
		int sSize = s.length();

		String tMinus1 = t.substring(0, sSize);

		if (tMinus1.equals(s)) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}


	}
}
