加密术

import java.util.Scanner;

public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner cin = new Scanner(System.in);
		while(cin.hasNext()){
			String str=cin.next();
			String str1=cin.next();
			char ch[]=str.toCharArray();
			char  ch1[]=str1.toCharArray();
			int i,k=0;
			for(i=0;i<ch1.length;i++)
			{
				if(ch1[i]==ch[k])
				{
					k++;
				}
				if(k==ch.length)
				{
					break;
				}
			}
			if(k==ch.length)
			{
				System.out.println("Yes");
			}
			else 
			{
				System.out.println("No");
			}
		}
	}
}