public String check2(String word) {
		String[] list = { "pi", "ka", "chu" };
		while (word.length() > 0) {
			boolean hit = false;
			for (String str : list) {
				if (word.startsWith(str)) {
					word = word.substring(str.length());
					hit = true;
				}
			}
			if (hit == false) {
				return "NO";
			}
		}

		return "YES";
	}