#https://i...content-available-to-author-only...e.com/9sc9iY
cisla = [int(_) for _ in input().split()]
#osetrime pripad ak rastie na zaciatku (prve dve cisla)
cisla.insert(0, float('inf')) #1+max(cisla) alebo 1+cisla[0]
#osetrime pripad ak rastie na konci (posledne dve cisla)
cisla.append(0) #pridame 0 na koniec,
for i in range(1, len(cisla)-1): #od druheho po predposledny
if cisla[i-1] < cisla[i] > cisla[i+1]: #lokalne maximum
print('predaj: ', cisla[i])
if cisla[i-1] > cisla[i] < cisla[i+1]: #lokalne minimum
print('nakup: ', cisla[i])
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