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