I having little problem adding a "-" to 20 charaters.. for example,
0K4CJQ6K7301T1159251

i was trying separate the long string by 4 and after every 4 charaters would add "-"

like this 0K4C-JQ6K-7301-T115-9251

how would i do this? i know looping is involve but dont know how to put together..



thank you for your time