import java.util.*;

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

class Main {
    public static void main (String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String T = sc.next();
        if (T.substring(0, S.length()).equals(S)) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
}