static void Main(string[] args)
{
int n = Convert.ToInt32(Console.ReadLine());
string[] arr = Console.ReadLine().Split(' ');
int l = arr.Length;
HashTable HT = new HashTable(n);
for (int i = 0; i < l; i++)
{
try
{
HT.insert(Convert.ToInt32(arr[i]));
}
catch { }
}
Console.WriteLine(n);
Console.WriteLine(Environment.NewLine + Environment.NewLine);
string s = n.ToString() + " " + Environment.NewLine;
for (int i = 0; i < n; i++)
{
s += Environment.NewLine + i.ToString() + ": ";
if (HT.values.Items[i] != null)
{
ListNode <int> cur = HT.values.Items[i];
while (cur != null)
{
s += cur.value + " ";
cur = cur.next;
}
}
}
Console.WriteLine(s);
}