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[Landrian]

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace words
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() != DialogResult.OK)
return;

textBox1.Text = openFileDialog1.FileName;
}

private void button2_Click(object sender, EventArgs e)
{
if (saveFileDialog1.ShowDialog() != DialogResult.OK)
return;

textBox2.Text = saveFileDialog1.FileName;
}

bool WordSymbol(char ch)
{
if (('a' <= ch) & (ch <= 'z')) return true;
if (('A' <= ch) & (ch <= 'Z')) return true;
if (('а' <= ch) & (ch <= 'я')) return true;
if (('а' <= ch) & (ch <= 'Я')) return true;

return false;
}

private void button3_Click(object sender, EventArgs e)
{
StreamReader in_s = new StreamReader(textBox1.Text);
StreamWriter out_s = new StreamWriter(textBox2.Text);

int K = Convert.ToInt32(textBox3.Text);
int i, i2;
string s, s2;

while (!in_s.EndOfStream)
{
s = in_s.ReadLine();

for (i = 0; i < s.Length; i++)
{
if (!WordSymbol(s[i]))
continue;

for (i2 = i + 1; i2 < s.Length; i2++)
if (!WordSymbol(s[i2]))
break;

if ((i2 - i) == K)
{
s2 = s.Substring(i, i2 - i);
out_s.WriteLine(s2);
}

i = i2;
}
}

out_s.Close();
in_s.Close();
}
}
}