using System;
using System.Collections.Generic;
using System.Linq;

namespace Catapult_Attack
{
    class Program
    {
        static void Main()
        {
            var pilesCount = int.Parse(Console.ReadLine());

            var wallsInput = Console
                .ReadLine()
                .Split(" ", StringSplitOptions.RemoveEmptyEntries)
                .Select(int.Parse)
                .ToArray();

            var walls = new Queue<int>(wallsInput);
            var rocks = new Stack<int>();

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

                var curPile = Console
                    .ReadLine()
                    .Split(" ", StringSplitOptions.RemoveEmptyEntries)
                    .Select(int.Parse)
                    .ToList();

                if (!walls.Any())
                {
                    Console.WriteLine($"Rocks left: {string.Join(", ", rocks)}");
                    break;
                }

                if (i % 3 == 0)
                {
                    walls.Enqueue(int.Parse(Console.ReadLine()));
                }

                foreach (var curRock in curPile)
                {
                    rocks.Push(curRock);
                }

                while (rocks.Any() && walls.Any())
                {
                    var rock = rocks.Pop();
                    var wall = walls.Dequeue();

                    if (rock > wall)
                    {
                        rocks.Push(rock - wall);
                    }

                    else if (rock < wall)
                    {
                        walls.Enqueue(wall - rock);

                        for (int j = 0; j < walls.Count - 1; j++)
                        {
                            walls.Enqueue(walls.Dequeue());
                        }
                    }
                }
            }

            if (!rocks.Any())
            {
                Console.WriteLine($"Walls left: {string.Join(", ", walls)}");
            }
        }
    }
}