using System;
using System.Text.RegularExpressions;
 
public class Test
{
	public static string SplitToLines(string str, int n)
	{
		return Regex.Replace(str, ".{"+n+"}(?!$)", "$0\n");
	}
 
	public static void Main()
	{
		Console.WriteLine("{0}", SplitToLines("0123456789qwertyuiop[]asdfghjkl;'zxcvbnm", 10));
		Console.WriteLine("==========");
		Console.WriteLine("{0}", SplitToLines("0123456789qwertyuiop[]asdfghjkl;'zxcvbnmzxc", 10));
		Console.WriteLine("==========");
		Console.WriteLine("{0}", SplitToLines("0123456789", 10));
		Console.WriteLine("==========");
		Console.WriteLine("{0}", SplitToLines("01234567", 10));
		Console.WriteLine("==========");
	}
}

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