import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner a = new Scanner(System.in);		
		String S = a.next();
		String T = a.next();
		String str = S + "[a-z]";
		
		if(T.matches(S + "[a-z]")) {
			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 a = new Scanner(System.in);		
		String S = a.next();
		String T = a.next();
		String str = S + "[a-z]";
		
		if(T.matches(S + "[a-z]")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	}
} Main public static void main(String[] args) {
		Scanner a = new Scanner(System.in);		
		String S = a.next();
		String T = a.next();
		String str = S + "[a-z]";
		
		if(T.matches(S + "[a-z]")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	} main {
		Scanner a = new Scanner(System.in);		
		String S = a.next();
		String T = a.next();
		String str = S + "[a-z]";
		
		if(T.matches(S + "[a-z]")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	} Scanner a = new Scanner(System.in); a new Scanner(System.in) String S = a.next(); S a.next() a.next a String T = a.next(); T a.next() a.next a String str = S + "[a-z]"; str S + "[a-z]" S "[a-z]" if(T.matches(S + "[a-z]")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		} T.matches(S + "[a-z]") T.matches T S + "[a-z]" S "[a-z]" {
			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 a = new Scanner(System.in);		
		String S = a.next();
		String T = a.next();
		String str = S + "[a-z]";
		
		if(T.matches(S + "[a-z]")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	}
} public class Main {

	public static void main(String[] args) {
		Scanner a = new Scanner(System.in);		
		String S = a.next();
		String T = a.next();
		String str = S + "[a-z]";
		
		if(T.matches(S + "[a-z]")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner a = new Scanner(System.in);		
		String S = a.next();
		String T = a.next();
		String str = S + "[a-z]";
		
		if(T.matches(S + "[a-z]")) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}
		
	}
}