/* package whatever; // don't place package name! */

import java.util.*;
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
	{
		for ( int i = 0; i < 10 ; ) {
            substring(i, i++);
        }
    }
    
    public static void substring(int a, int b) {
        System.out.println("calling substring(" + a + ", " + b + ")");
    }
}