File name ingredients$\_$data and value one$\_$ingredient$\_$val are read from input. Perform the following tasks:

Open the file ingredients$\_$data with the $\text{'}$a$+\text{'}$ update mode for reading and appending at the same time. Assign ingredients$\_$file with the opened file.

Write one$\_$ingredient$\_$val to ingredients$\_$file without overwriting any existing contents.

Call ingredients$\_$file's flush$().$