Hello!

I have some stock codes (the variable is called ticker) which start with different numbers and all with 6 digits. I only want to retain those who start with 0, 3, or 6 and drop others (such as the bold ones in the example below). How can I do this? Thanks!

Code:
"600239"
"001979"
"300059"
"300498"
"200725"
"000958"
"600390"
"900923"
"600096"
"000301"
"900928"