public static void Main()
{
#if DEBUG
Console.SetIn(new System.IO.StreamReader("../../input.txt"));
#endif
var output = new StringBuilder();
var line = Console.ReadLine();
while (line != "End")
{
var command = new Command(line);
switch (command.Name)
{
case "Append":
AppendCommand(command, output);
break;
case "Insert":
InsertCommand(command, output);
break;
case "Find":
FindCommand(command, output);
break;
case "Serve":
ServeCommand(command, output);
break;
default:
break;
}
line = Console.ReadLine();
}
Console.Write(output);
}
private static void AppendCommand(Command command, StringBuilder output)
{
name.Add(command.Param);
if (!findNames.ContainsKey(command.Param))
{
findNames.Add(command.Param, 0);
}
findNames[command.Param]++;
output.AppendLine("OK");
}
private static void InsertCommand(Command command, StringBuilder output)
{
if (command.Index >= 0 && name.Count >= command.Index)
{
name.Insert(command.Index, command.Param);
if (!findNames.ContainsKey(command.Param))
{
findNames.Add(command.Param, 0);
}
findNames[command.Param]++;
output.AppendLine("OK");
}
else
{
output.AppendLine("Error");
}
}
private static void ServeCommand(Command command, StringBuilder output)
{
int count = int.Parse(command.Param);
if (count > name.Count)
{
output.AppendLine("Error");
}
else
{
while (count > 0)
{
output.Append(name[0] + " ");
if (findNames.ContainsKey(name[0]))
{
findNames[name[0]]--;
}
name.RemoveAt(0);
count--;
}
output.Append(Environment.NewLine);
}
}
private static void FindCommand(Command command, StringBuilder output)
{
if (findNames.ContainsKey(command.Param))
{
output.AppendLine(findNames[command.Param].ToString());
}
else
{
output.AppendLine("0");
}
}