/* 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
	{
		ArrayList<List<Integer>> group = new ArrayList<>();
		group.add(Arrays.asList(2, 3, 4));
		group.add(Arrays.asList(4, 5, 6));
		group.add(Arrays.asList(7, 8, 9));
		setValue(group, 1, 1, 75);
		System.out.println(group);
	}
 
	public static void setValue(List<List<Integer>> list, int row, int column, int value){
		list.get(row).set(column, value);
	}
}

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