
import java.util.*;
public class Main{

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.nextLine();
        String t = scan.nextLine();

        if(s.equals(t.substring(0,t.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 scan = new Scanner(System.in);
        String s = scan.nextLine();
        String t = scan.nextLine();

        if(s.equals(t.substring(0,t.length()-1))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    }
} Main public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.nextLine();
        String t = scan.nextLine();

        if(s.equals(t.substring(0,t.length()-1))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    } main {
        Scanner scan = new Scanner(System.in);
        String s = scan.nextLine();
        String t = scan.nextLine();

        if(s.equals(t.substring(0,t.length()-1))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String s = scan.nextLine(); s scan.nextLine() scan.nextLine scan String t = scan.nextLine(); t scan.nextLine() scan.nextLine scan if(s.equals(t.substring(0,t.length()-1))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        } s.equals(t.substring(0,t.length()-1)) s.equals s t.substring(0,t.length()-1) t.substring t 0 t.length()-1 t.length() t.length t 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 scan = new Scanner(System.in);
        String s = scan.nextLine();
        String t = scan.nextLine();

        if(s.equals(t.substring(0,t.length()-1))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    }
} public class Main{

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.nextLine();
        String t = scan.nextLine();

        if(s.equals(t.substring(0,t.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 scan = new Scanner(System.in);
        String s = scan.nextLine();
        String t = scan.nextLine();

        if(s.equals(t.substring(0,t.length()-1))){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    }
}