import java.util.Scanner;


public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        String line = sc.nextLine();
        String line2 = sc.nextLine();
      
      	if(line2.contains(line)){
      		if(line.charAt(0) == line2.charAt(0)){
      			System.out.println("Yes");
      		}else{
      			System.out.println("No");
      		}
        }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