import 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();
		String s = S.substring(0, S.length());
		String t = T.substring(0, S.length());
		if(s.equals(t))
		System.out.println("Yes");
		else
		System.out.println("No");
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String T = sc.next();
		String s = S.substring(0, S.length());
		String t = T.substring(0, S.length());
		if(s.equals(t))
		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.next();
		String T = sc.next();
		String s = S.substring(0, S.length());
		String t = T.substring(0, S.length());
		if(s.equals(t))
		System.out.println("Yes");
		else
		System.out.println("No");
	} main {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String T = sc.next();
		String s = S.substring(0, S.length());
		String t = T.substring(0, S.length());
		if(s.equals(t))
		System.out.println("Yes");
		else
		System.out.println("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 String s = S.substring(0, S.length()); s S.substring(0, S.length()) S.substring S 0 S.length() S.length S String t = T.substring(0, S.length()); t T.substring(0, S.length()) T.substring T 0 S.length() S.length S if(s.equals(t))
		System.out.println("Yes");
		else
		System.out.println("No"); s.equals(t) s.equals s t System.out.println("Yes") System.out.println System.out System System.out "Yes" 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.next();
		String T = sc.next();
		String s = S.substring(0, S.length());
		String t = T.substring(0, S.length());
		if(s.equals(t))
		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.next();
		String T = sc.next();
		String s = S.substring(0, S.length());
		String t = T.substring(0, S.length());
		if(s.equals(t))
		System.out.println("Yes");
		else
		System.out.println("No");
	}
} Main
import 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();
		String s = S.substring(0, S.length());
		String t = T.substring(0, S.length());
		if(s.equals(t))
		System.out.println("Yes");
		else
		System.out.println("No");
	}
}