import java.io.*;

public class Tt
{
public BufferedReader setBf(BufferedReader b)
{

b = new BufferedReader(new InputStreamReader(System.in));

return b;

}

public String getSt(BufferedReader b)
{
String str = new String();
try
{
str = b.readLine();

}
catch(IOException e)
{
this.show4();
}
return str;
}