import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      
      	String strS = sc.next();
      	
      	String strT = sc.next();
      
     	strT = strT.substring(0, strT.length() - 1);
       	
      	if (strS.equals(strT)) {
        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 strS = sc.next();
      	
      	String strT = sc.next();
      
     	strT = strT.substring(0, strT.length() - 1);
       	
      	if (strS.equals(strT)) {
        System.out.println("Yes");
        } else {
        System.out.println("No");
        }
  	
	}
} Main public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      
      	String strS = sc.next();
      	
      	String strT = sc.next();
      
     	strT = strT.substring(0, strT.length() - 1);
       	
      	if (strS.equals(strT)) {
        System.out.println("Yes");
        } else {
        System.out.println("No");
        }
  	
	} main {
		Scanner sc = new Scanner(System.in);
      
      	String strS = sc.next();
      	
      	String strT = sc.next();
      
     	strT = strT.substring(0, strT.length() - 1);
       	
      	if (strS.equals(strT)) {
        System.out.println("Yes");
        } else {
        System.out.println("No");
        }
  	
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String strS = sc.next(); strS sc.next() sc.next sc String strT = sc.next(); strT sc.next() sc.next sc strT = strT.substring(0, strT.length() - 1) strT strT.substring(0, strT.length() - 1) strT.substring strT 0 strT.length() - 1 strT.length() strT.length strT 1 if (strS.equals(strT)) {
        System.out.println("Yes");
        } else {
        System.out.println("No");
        } strS.equals(strT) strS.equals strS strT {
        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 strS = sc.next();
      	
      	String strT = sc.next();
      
     	strT = strT.substring(0, strT.length() - 1);
       	
      	if (strS.equals(strT)) {
        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 strS = sc.next();
      	
      	String strT = sc.next();
      
     	strT = strT.substring(0, strT.length() - 1);
       	
      	if (strS.equals(strT)) {
        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 strS = sc.next();
      	
      	String strT = sc.next();
      
     	strT = strT.substring(0, strT.length() - 1);
       	
      	if (strS.equals(strT)) {
        System.out.println("Yes");
        } else {
        System.out.println("No");
        }
  	
	}
}