import java.util.*;
public class Main{
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    String t = sc.next();

    for(int i=0 ; i<s.length() ; i++){
      if(i<s.length()-1){
        if(s.charAt(i)==t.charAt(i)){
          continue;
        }else{
          System.out.println("No");
          break;
        }
      }else{
        if(s.charAt(i)==t.charAt(i)){
          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