import java.io.*;
import java.util.*;
import java.math.*;
import java.text.*;


public class allinall {

    public static boolean subseq(String s, String t) {
	int p = 0;
	char c;

	for (int i = 0; i < s.length(); i++) {
	    c = s.charAt(i);
	    
			while (true) 
			{
	       if (p>= t.length()) return false;
	       if (c == t.charAt(p))
				 {
				  p++;
				   break;
					}
					else p++;
					
	    }
	}
	return true;	
 }


    public static void main(String[] args) throws Exception {
	BufferedReader f = new BufferedReader(new FileReader("allinall.in"));
	StringTokenizer st;

	String line;
	String s, t;

	while ((line = f.readLine()) != null) {
	    st = new StringTokenizer (line);
	    
	    s = st.nextToken();
	    t = st.nextToken();
	    
            if (subseq(s, t)) System.out.println("Yes");
	    else System.out.println("No");
	}
    }
}