Short Term Memory

Memorise 4 aeronautical parameters, then recall the ones that disappear.

F 11825 Frequency
A 3100 Altitude
H 014 Heading
S 250 Speed

Some vanish — type them back in any order.

Example input
A3100 ↵ H014 ↵
10 series, 4 parameters each
40 seconds total — be fast
1 → 3 missing params, difficulty rises