Mini-challenge: 3 lines of code

[Csaba Tizedes]

Valentin, this is really beautiful challenge - but: Saturday morning (in CET), I'm hungry, I want my coffee too, so I guess the best answer now:

If you do nothing, you can't go wrong.

HP-15C version:

LBL A
RTN

2 lines only, usage: [f] [USER] [A]

Csaba