Search by contain letter in a column

Hello, everyone

I need a filter function that searches by letter in a cell, and it should be a macro.

To clarify further,

if I have a column with several names and I chose a search cell and what I want is search

by a single letter, for example,

"a"

then it should Filtering names and show me all the names that contain the letter "a", such as

David

Ronaldo

Adam

Alen

Lina