public static int getLength(String s, int start, int end, int maxLength) {
		int step = 1;
		int length = s.length();
		// int maxLength = 0;
		while (end < length && start >= 0) {
			if (s.charAt(start) == s.charAt(end)) {
				start -= step;
				end += step;
				maxLength += 2;
			} else {
				break;
			}

		}
		return maxLength;
	}