/* package whatever; // don't place package name! */
 
import java.util.*;
import java.util.regex.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
 
 
Pattern p = Pattern.compile("start(.*?)(?:x|y)");
Matcher m = p.matcher("You start programming by writing hello world program");
if (m.find()) {
    String sub = m.group(1);
    System.out.println(sub);
}
 
 
	}
}

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