import java.util.Scanner;

public class Main{

    public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        String a="";
        String b="";
        a=sc.nextLine();
        b=sc.nextLine();

        if(a.equals(b.substring(0,a.length()))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }


    }

} import java.util.Scanner; Scanner java.util public class Main{

    public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        String a="";
        String b="";
        a=sc.nextLine();
        b=sc.nextLine();

        if(a.equals(b.substring(0,a.length()))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }


    }

} Main public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        String a="";
        String b="";
        a=sc.nextLine();
        b=sc.nextLine();

        if(a.equals(b.substring(0,a.length()))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }


    } main {
        Scanner sc = new Scanner(System.in);
        String a="";
        String b="";
        a=sc.nextLine();
        b=sc.nextLine();

        if(a.equals(b.substring(0,a.length()))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }


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

        if(a.equals(b.substring(0,a.length()))){
            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="";
        String b="";
        a=sc.nextLine();
        b=sc.nextLine();

        if(a.equals(b.substring(0,a.length()))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }


    }

} Main
import java.util.Scanner;

public class Main{

    public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        String a="";
        String b="";
        a=sc.nextLine();
        b=sc.nextLine();

        if(a.equals(b.substring(0,a.length()))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }


    }

}