import java.util.*;


public class Main{
    public static void main(String[] args) throws Exception{
        
        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");
        }
    }
} import java.util.*; util.* java public class Main{
    public static void main(String[] args) throws Exception{
        
        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 public static void main(String[] args) throws Exception{
        
        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" String[] args args public class Main{
    public static void main(String[] args) throws Exception{
        
        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 class Main{
    public static void main(String[] args) throws Exception{
        
        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
import java.util.*;


public class Main{
    public static void main(String[] args) throws Exception{
        
        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");
        }
    }
}