cisla = [int(_) for _ in input().split()]
for i in range(1, len(cisla)-1): #od druheho po predposledny
if cisla[i-1] < cisla[i] > cisla[i+1]:
print('predaj ', cisla[i])
if cisla[i-1] > cisla[i] < cisla[i+1]:
print('nakup ', cisla[i])
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