import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String t = sc.next();
        sc.close();
        s += t.charAt(t.length() - 1);
        if(s.equals(t)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String t = sc.next();
        sc.close();
        s += t.charAt(t.length() - 1);
        if(s.equals(t)){
            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();
        sc.close();
        s += t.charAt(t.length() - 1);
        if(s.equals(t)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    } main {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String t = sc.next();
        sc.close();
        s += t.charAt(t.length() - 1);
        if(s.equals(t)){
            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 sc.close() sc.close sc s += t.charAt(t.length() - 1) s t.charAt(t.length() - 1) t.charAt t t.length() - 1 t.length() t.length t 1 if(s.equals(t)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        } s.equals(t) s.equals s t {
            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 s = sc.next();
        String t = sc.next();
        sc.close();
        s += t.charAt(t.length() - 1);
        if(s.equals(t)){
            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 s = sc.next();
        String t = sc.next();
        sc.close();
        s += t.charAt(t.length() - 1);
        if(s.equals(t)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }
} Main
import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String t = sc.next();
        sc.close();
        s += t.charAt(t.length() - 1);
        if(s.equals(t)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }
    }
}