/// <summary>
/// The mode of the set of lengths of lines in a string. Whatever
/// number occurs the most as length of characters in a line is returned.
/// </summary>
/// <returns>The line length that occurs the most.</returns>
/// <param name="input">Input.</param>
private int LengthMode(string input)
{
string[] lines = input.Split('\n');
var modes = new System.Collections.Generic.Dictionary <int, int>();
foreach (var line in lines)
{
if (modes.ContainsKey(line.Length))
{
modes[line.Length] += 1;
}
else
{
modes[line.Length] = 1;
}
}
return(modes.Aggregate(modes.First(), (a, b) => {
if (b.Value > a.Value)
{
return b;
}
else
{
return a;
}
}).Key);
}