#https://i...content-available-to-author-only...e.com/tIRros
#funguje aj pre rovnake ceny v dvoch po sebe iducich dnoch
cisla = [int(_) for _ in input().split()]
mam = 'eur';
for i in range(len(cisla)-1):
if cisla[i]<cisla[i+1] and mam == 'eur':
print('nakup: ', cisla[i])
mam = 'zlato'
if cisla[i]>cisla[i+1] and mam == 'zlato':
print('predaj: ', cisla[i])
mam = 'eur'
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