/* program Test_SB.java */

class ReverseString {
	static String reverse(String s) {
	int len = s.length();
	StringBuffer result = new StringBuffer(len);

	for(int i = len-1; i >= 0; --i)
		result.append(s.charAt(i));
	return result.toString();
	}
}

class Test_SB {
	public static void main(String[] args) {
		String s;
		s = ReverseString.reverse(args[0]);
		System.out.println(s);
	}
}