import java.util.*;
import java.io.*;
public class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw=new PrintWriter(System.out);
        /*String str[]=br.readLine().split(" ");
        int n=Integer.parseInt(str[0]);
        int k=Integer.parseInt(str[1]);
        */
        char carr1[]=br.readLine().toCharArray();
        char carr2[]=br.readLine().toCharArray();
        boolean b=true;
        for(int i=0;i<carr1.length;i++)
        {
            if(carr1[i]!=carr2[i])
            {
                b=false;
                break;
            }
        }
        if(b)
        pw.println("Yes");
        else
        pw.println("No");
        pw.flush();
        pw.close();
    }
}
/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