Problem

5 /5


Iterating over lines #2

Problem

In the alphabet of the language of the tribe «Tumba-Yumba» four letters: "K", "L", "M" and "N". We need to display all possible words consisting of n letters (n > 1) in which the second letter is «K». Count the number of such words. 
 
Examples
# Input Output
1 2 KK
LK
MK
NK
4

(c)  K.Yu. Polyakov

time 1000 ms
memory 256 Mb
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