public class TrabajoClase {
	public static void main(String[] args) {
		System.out.println(convertir("123"));
	}
	public static String convertir(String s) {
		String num = "";
		for (int i = s.length() - 1; i >= 0; i--) {
			num += s.charAt(i);
		}return num;


	}
}