how to use HTML to add "-" to fix in input box?

Bfspfwbm

New member
Hi everyone..how to make the input text box with "-" ?

like the text box is look like " - "

before the dash is 4 size, after the dash is 10 size.

whatever user key in 6 digits, it will become like this "1234-56"

how to make it like this in HTML?
 
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