comparator with memory

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when the input signal isn't signal of keypad i have 0 ont the out...

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That's correct. The process you wrote indeed makes this.

Infact every time the process runs (when 'in' changes), you assign

li1 := "00000000";

li2 := "00000000";

then, whenever the 'if' condition is not fulfilled (namely when signal is not from keypad)

your output keeps this zero status.

If your code is supposed to hold the last keypad code on 'out' as long as a non-keypad code is received, simply remove these 2 lines.