using System;

using System.Collections.Generic;

public class Program

{

    public static bool isPrimeNumber(int x) {

        int count = 0;

        for(int i = 1; i <= x; i++){

            if(x%i == 0){

                count++;

            }

        }

        if (count == 2) return true;

        else return false;

    }

    public static void removeAllPrime(List<int> list){

        int i = 0;

        while (i < list.Count){

            if(isPrimeNumber(list[i])){

                list.RemoveAt(i);

            }else i++;

        }

    }

    public static void Main(){

        List<int> list = new List<int>() {1, 2, 7,8,9,10,22,13,-1};

        if(list.Count < 1){

            Console.WriteLine("Error!");

        }else {

        Program.removeAllPrime(list);

        foreach(var number in list) {

            Console.Write(number + " ");

        }

        }

    }

}