import java.util.*;
public class Main {
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		String s=in.next();
		String str=in.next();
		if(s.compareToIgnoreCase(str.substring(0,str.length()-1))==0)
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
} import java.util.*; util.* java public class Main {
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		String s=in.next();
		String str=in.next();
		if(s.compareToIgnoreCase(str.substring(0,str.length()-1))==0)
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
} Main public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		String s=in.next();
		String str=in.next();
		if(s.compareToIgnoreCase(str.substring(0,str.length()-1))==0)
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	} main {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		String s=in.next();
		String str=in.next();
		if(s.compareToIgnoreCase(str.substring(0,str.length()-1))==0)
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	} Scanner in = new Scanner(System.in); in new Scanner(System.in) String s=in.next(); s in.next() in.next in String str=in.next(); str in.next() in.next in if(s.compareToIgnoreCase(str.substring(0,str.length()-1))==0)
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		} s.compareToIgnoreCase(str.substring(0,str.length()-1))==0 s.compareToIgnoreCase(str.substring(0,str.length()-1)) s.compareToIgnoreCase s str.substring(0,str.length()-1) str.substring str 0 str.length()-1 str.length() str.length str 1 0 {
			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) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		String s=in.next();
		String str=in.next();
		if(s.compareToIgnoreCase(str.substring(0,str.length()-1))==0)
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
} public class Main {
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		String s=in.next();
		String str=in.next();
		if(s.compareToIgnoreCase(str.substring(0,str.length()-1))==0)
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
} Main
import java.util.*;
public class Main {
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		String s=in.next();
		String str=in.next();
		if(s.compareToIgnoreCase(str.substring(0,str.length()-1))==0)
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
}