import java.util.*;
public class Main {
    public static void main(String[] args ){
        Scanner o = new Scanner(System.in);
        String s1 = o.nextLine();
        String s2 = o.nextLine();
        boolean ok = true;
        for ( int i = 0 ; i < s1.length() ; i++ )
        {
            if ( s1.charAt(i) != s2.charAt(i) )
            {
                ok = false;
                break;
            }
        }

        if(!ok){
            System.out.println("No");
        }
        else{
            System.out.println("Yes");
        }
        
    }
}
/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