1. Move the cursor to the position where you want to operate.
2. Press CTRL + v into "visible" mode, select the column to operate on each row.
select multiple coulmns using left/right arrow
select multiple rows using up/down arrow
3. Enter SHIFT + i (I) to insert the contents which you want to input.
4. Press ESC twice, the inserted contents appear in selected areas of the each row.
