View Code of Problem 54

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        StringBuilder stringBuilder = new StringBuilder(s.nextLine());
        for (int i = 0; i < stringBuilder.length(); i++) {
            System.out.print(stringBuilder.charAt(i));
            if (i != stringBuilder.length() - 1) {
                System.out.print(" ");
            }
        }
    }
}