import java.util.*;

public class Main {
    public static void main(String[] args){
        
        Scanner scanner = new Scanner(System.in);
        String S = scanner.next();
        String T = scanner.next();
        
        if(T.contains(S) && S.charAt(0)==T.charAt(0)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

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

    }
} Main public static void main(String[] args){
        
        Scanner scanner = new Scanner(System.in);
        String S = scanner.next();
        String T = scanner.next();
        
        if(T.contains(S) && S.charAt(0)==T.charAt(0)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    } main {
        
        Scanner scanner = new Scanner(System.in);
        String S = scanner.next();
        String T = scanner.next();
        
        if(T.contains(S) && S.charAt(0)==T.charAt(0)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) String S = scanner.next(); S scanner.next() scanner.next scanner String T = scanner.next(); T scanner.next() scanner.next scanner if(T.contains(S) && S.charAt(0)==T.charAt(0)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        } T.contains(S) && S.charAt(0)==T.charAt(0) T.contains(S) T.contains T S S.charAt(0)==T.charAt(0) S.charAt(0) S.charAt S 0 T.charAt(0) T.charAt T 0 {
            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 scanner = new Scanner(System.in);
        String S = scanner.next();
        String T = scanner.next();
        
        if(T.contains(S) && S.charAt(0)==T.charAt(0)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    }
} public class Main {
    public static void main(String[] args){
        
        Scanner scanner = new Scanner(System.in);
        String S = scanner.next();
        String T = scanner.next();
        
        if(T.contains(S) && S.charAt(0)==T.charAt(0)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args){
        
        Scanner scanner = new Scanner(System.in);
        String S = scanner.next();
        String T = scanner.next();
        
        if(T.contains(S) && S.charAt(0)==T.charAt(0)){
            System.out.println("Yes");
        }else{
            System.out.println("No");
        }

    }
}
