public class RevString {

    public static String reverseString(String str) {
	if (str.length() == 0)
	    return "";

	int len = str.length();
	char lastChar = str.charAt(len-1);
	String restOfStringReversed = reverseString(str.substring(0,len-1));
	return lastChar + restOfStringReversed;
	//return str.substring(len-1,len) + reverseString(str.substring(0,len-1));
    }

    public static void main(String[] args) {

	System.out.println(args[0] + " reversed is " + reverseString(args[0]));
    }
}