Change Pi

Change Pi
Given a string, compute recursively (no loops) a new string where all appearances of "pi" have been replaced by "3.14".

Input
On the first line you will be given the string

Output
On the only output line you should print the result

Sample tests
Input
xpix
Output
x3.14x
Input
pipi
Output
3.143.14

import java.util.Scanner;

public class ChangePi {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        System.out.println(newString(input));
    }

    static String newString(String input) {
        if (input.length() <= 1) {
            return input;
        }
        if (input.charAt(0) == 'p' && input.charAt(1) == 'i') {
            return "3.14" + newString(input.substring(2, input.length()));
        }
        return input.charAt(0) + newString(input.substring(1, input.length()));
    }
}