import java.util.Scanner;

public class Main {

    public Main(){
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String T = sc.next();

        if(T.startsWith(S)){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }

    public static void main(String[] args) {
        Main M = new Main();
    }
} import java.util.Scanner; Scanner java.util public class Main {

    public Main(){
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String T = sc.next();

        if(T.startsWith(S)){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }

    public static void main(String[] args) {
        Main M = new Main();
    }
} Main public Main(){
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String T = sc.next();

        if(T.startsWith(S)){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } Main {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String T = sc.next();

        if(T.startsWith(S)){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc String T = sc.next(); T sc.next() sc.next sc if(T.startsWith(S)){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        } T.startsWith(S) T.startsWith T S {
            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" public static void main(String[] args) {
        Main M = new Main();
    } main {
        Main M = new Main();
    } Main M = new Main(); M new Main() String[] args args public class Main {

    public Main(){
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String T = sc.next();

        if(T.startsWith(S)){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }

    public static void main(String[] args) {
        Main M = new Main();
    }
} public class Main {

    public Main(){
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String T = sc.next();

        if(T.startsWith(S)){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }

    public static void main(String[] args) {
        Main M = new Main();
    }
} Main
import java.util.Scanner;

public class Main {

    public Main(){
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String T = sc.next();

        if(T.startsWith(S)){
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }

    public static void main(String[] args) {
        Main M = new Main();
    }
}
