private static void Write(int year, int day, string input)
{
File.WriteAllText(InputHelper.GetFileName(year, day), input);
}
private static Task <string> Read(int year, int day)
{
return(File.ReadAllTextAsync(InputHelper.GetFileName(year, day)));
}
private static bool Exists(int year, int day)
{
return(File.Exists(InputHelper.GetFileName(year, day)));
}