import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		String t = sc.next();
		System.out.println(t.startsWith(s) ? "Yes" : "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.next();
		String t = sc.next();
		System.out.println(t.startsWith(s) ? "Yes" : "No");
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		String t = sc.next();
		System.out.println(t.startsWith(s) ? "Yes" : "No");
	} main {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		String t = sc.next();
		System.out.println(t.startsWith(s) ? "Yes" : "No");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc String t = sc.next(); t sc.next() sc.next sc System.out.println(t.startsWith(s) ? "Yes" : "No") System.out.println System.out System System.out t.startsWith(s) ? "Yes" : "No" t.startsWith(s) t.startsWith t s "Yes" "No" String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		String t = sc.next();
		System.out.println(t.startsWith(s) ? "Yes" : "No");
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		String t = sc.next();
		System.out.println(t.startsWith(s) ? "Yes" : "No");
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		String t = sc.next();
		System.out.println(t.startsWith(s) ? "Yes" : "No");
	}
}
