using System;
using System.Text;
 
public class Test
{
	public static string SplitToLines(string str, int n)
	{
		var sb = new StringBuilder(str.Length + (str.Length + 9) / 10);
 
		for (int q=0; q<str.Length; )
		{
			sb.Append(str[q]);
 
			if (++q % n == 0)
				sb.AppendLine();
		}
 
		if (str.Length % n == 0)
			--sb.Length;
 
		return sb.ToString();
	}
 
	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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