#https://i...content-available-to-author-only...e.com/fjrQZV
 
cisla = [int(_) for _ in input().split()]
# na zaciatok dame nekonecno (prve bude min, ak rastie na zaciatku)
cisla.insert(0, float('inf')) #moze byt aj 1+max(cisla)
# na koniec pridame 0 (posledne bude max, ak rastie na konci)
cisla.append(0) 
 
for i in range(1, len(cisla)-1): #od druheho po predposledny
	if cisla[i-1] < cisla[i] > cisla[i+1]: #na i-tej pozicii je lokalne maximum
		print('predaj ', cisla[i])
	if cisla[i-1] > cisla[i] < cisla[i+1]: #na i-tej pozicii je lokalne minimum
		print('nakup ', cisla[i])
 
 

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