import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        String s1=in.nextLine();
        String s2=in.nextLine();
        StringBuilder sb=new StringBuilder(s1);
        sb.append(s2.charAt(s2.length()-1));
        if(s2.contains(sb)){
            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