
import java.util.*;
import java.io.*;

import static java.lang.Character.isUpperCase;

public class Main {

    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);

        String str = in.next();
        String sc = in.next();


        int a = sc.length()-1;


        str =  str + sc.charAt(a);


        if(str.equals(sc))
        {
            System.out.println("Yes");

        }
        else
            {
                System.out.println("No");
            }
    }







    }




/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz