В чем ошибка?
package com.javarush.task.task07.task0713;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
/*
Играем в Jолушку
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
ArrayList<Integer> mainArray = new ArrayList<>();
ArrayList<Integer> first = new ArrayList<>();
ArrayList<Integer> second = new ArrayList<>();
ArrayList<Integer> third = new ArrayList<>();
for (int i = 0; i < 20; i++) mainArray.add(Integer.parseInt(in.readLine()));
for (int i = 0; i < mainArray.size(); i++)
if (mainArray.get(i) % 3 == 0)
first.add(mainArray.get(i));
for (int i = 0; i < mainArray.size(); i++)
if (mainArray.get(i) % 2 == 0)
second.add(mainArray.get(i));
for (int i = 0; i < mainArray.size(); i++)
if (mainArray.get(i) % 3 != 0 || mainArray.get(i) % 2 != 0)
third.add(mainArray.get(i));
printList(mainArray);
printList(first);
printList(second);
printList(third);
}
public static void printList(ArrayList<Integer> list) {
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i));
}
}
}