What is printed when the following program is executed?

public class ModifyArray {
    public static void modify(int[][] matrix) {
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                matrix[i][j] += i;
            }
        }
    }
    public static void main(String[] args) {
        int[][] grid = { {1,2}, {3,4} };
        modify(grid);
        System.out.print(grid[1][0] + " " + grid[1][1]);
    }
}