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


    }
} Main public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        String a=sc.next();
        String b=sc.next();
        if (a.equalsIgnoreCase(b.substring(0,b.length()-1))){
            System.out.println("Yes");
        }else {
            System.out.println("No");
        }


    } main {
        Scanner sc=new Scanner(System.in);
        String a=sc.next();
        String b=sc.next();
        if (a.equalsIgnoreCase(b.substring(0,b.length()-1))){
            System.out.println("Yes");
        }else {
            System.out.println("No");
        }


    } Scanner sc=new Scanner(System.in); sc new Scanner(System.in) String a=sc.next(); a sc.next() sc.next sc String b=sc.next(); b sc.next() sc.next sc if (a.equalsIgnoreCase(b.substring(0,b.length()-1))){
            System.out.println("Yes");
        }else {
            System.out.println("No");
        } a.equalsIgnoreCase(b.substring(0,b.length()-1)) a.equalsIgnoreCase a b.substring(0,b.length()-1) b.substring b 0 b.length()-1 b.length() b.length b 1 {
            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 a=sc.next();
        String b=sc.next();
        if (a.equalsIgnoreCase(b.substring(0,b.length()-1))){
            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 a=sc.next();
        String b=sc.next();
        if (a.equalsIgnoreCase(b.substring(0,b.length()-1))){
            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 a=sc.next();
        String b=sc.next();
        if (a.equalsIgnoreCase(b.substring(0,b.length()-1))){
            System.out.println("Yes");
        }else {
            System.out.println("No");
        }


    }
}
