public class Main {
        static int swapParams(int num, int k, int nDigit) {
            StringBuilder myName = new StringBuilder(Integer.toString(num));
            myName.setCharAt(k-1, Integer.toString(nDigit).charAt(0));
            return Integer.parseInt(myName.toString());
        }
        public static void main(String[] args) {
            System.out.println(swapParams(5498, 2, 3));
        }
    }