#include<cstdio>
#include <vector>
#include <string>
#include <string.h>
#include<iostream>
#include<algorithm>
using namespace std;
int n,m;
int main()
{
	vector<int>a;
	int n,len;
	while(scanf("%d",&n)!=EOF)
	{
		a.push_back(n);
		//cout<<n<<endl;
		if(getchar()=='\n')
			break;
	}
	len=a.size();
	sort(a.begin(),a.end());
	for(int i=0;i<len;i++)
	{
		if((i+1)%4==0)
			printf("%d\n",a[i]);
		else
			printf("%d ",a[i]);
	}
	//system("pause");
}