### 2.4.4 ASCII code of a character : `ord`

`ord` takes as argument a string `s` (resp. a list `l` of strings).
`ord` returns the ASCII code of the first character of `s` (resp the list of the ASCII codes of the first character of the elements of `l`).
Input :

`ord("a")`

Output :

`97`

Input :

`ord("abcd")`

Output :

`97`

Input :

`ord(["abcd","cde"])`

Output :

`[97,99]`

Input :

`ord(["a","b","c","d"])`

Output :

`[97,98,99,100]`