import java.util.Scanner;

class Main{
  public static void main(String[] args){
    Scanner scan=new Scanner(System.in);
    String a=scan.next();
    String b=scan.next();
    String[] a1=a.split("");
    String[] b1=b.split("");
    boolean flag=true;
    for(int x=0; x<a1.length; x++){
      if(!(a1[x].equals(b1[x]))){
        flag=false;
      }
    }
    if(flag){
      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