#include <iostream>
using namespace std;

void Nhap(int a[], int size);
void DayCon(int a[], int size);;

int main()
{
	int a[100];
	int size;
	cin >> size;
	Nhap(a, size);	
	DayCon(a, size);
	return 0;
}

void Nhap(int a[], int size) {
	for (int i = 0; i < size; i++)
	{
		cin >> a[i];
	}
}

void DayCon(int a[],int size){
	for (int i = 0; i < size - 1; i++)
	{
		int tong = a[i] + a[i + 1];
		for (int j = i + 1; j < size; j++)
		{
			if (tong != 0) {
				tong += a[j + 1];
			}
			else {
				cout << "{ ";
				for (int k = i; k <= j; k++)
				{
					cout << a[k] << " ";
				}
				cout << "}" << endl;
				tong += a[j + 1];
			}
		}
	}
}