import java.util.Scanner;

 


public class Main {
        public static void main(String[] args) {
         
          Scanner sc = new Scanner(System.in);
         
          String s = sc.next(); 
          String t = sc.next(); 
          
      
         String T1 = t.substring(s.length() - 0); 
 

           if(t.equals(s+T1)) 
           {
             System.out.println("Yes");
           }
        else{
           System.out.println("No");
            }
         }
      } import java.util.Scanner; Scanner 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(); 
          
      
         String T1 = t.substring(s.length() - 0); 
 

           if(t.equals(s+T1)) 
           {
             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(); 
          
      
         String T1 = t.substring(s.length() - 0); 
 

           if(t.equals(s+T1)) 
           {
             System.out.println("Yes");
           }
        else{
           System.out.println("No");
            }
         } main {
         
          Scanner sc = new Scanner(System.in);
         
          String s = sc.next(); 
          String t = sc.next(); 
          
      
         String T1 = t.substring(s.length() - 0); 
 

           if(t.equals(s+T1)) 
           {
             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 String T1 = t.substring(s.length() - 0); T1 t.substring(s.length() - 0) t.substring t s.length() - 0 s.length() s.length s 0 if(t.equals(s+T1)) 
           {
             System.out.println("Yes");
           }
        else{
           System.out.println("No");
            } t.equals(s+T1) t.equals t s+T1 s T1 {
             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(); 
          
      
         String T1 = t.substring(s.length() - 0); 
 

           if(t.equals(s+T1)) 
           {
             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(); 
          
      
         String T1 = t.substring(s.length() - 0); 
 

           if(t.equals(s+T1)) 
           {
             System.out.println("Yes");
           }
        else{
           System.out.println("No");
            }
         }
      } Main
import java.util.Scanner;

 


public class Main {
        public static void main(String[] args) {
         
          Scanner sc = new Scanner(System.in);
         
          String s = sc.next(); 
          String t = sc.next(); 
          
      
         String T1 = t.substring(s.length() - 0); 
 

           if(t.equals(s+T1)) 
           {
             System.out.println("Yes");
           }
        else{
           System.out.println("No");
            }
         }
      }