3
12ajf
fi8x_a
ff  ai_2
  
  

  
  

   
   no
yes
no
  
  
  
  

   
   
package hdu2024;

import java.io.BufferedInputStream;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner cin = new Scanner(new BufferedInputStream(System.in));
		String s = "^[a-zA-Z|$|_]\\w+$";

		int count = cin.nextInt();
		String str = cin.nextLine();
		for (int i = 0; i < count; i++) {

			str = cin.nextLine();
			if (str.matches(s)) {
				System.out.println("yes");
			} else {
				System.out.println("no");
			}
		}
	}
}