import random as r
list = [[r.randint(-3,3) for j in range(3)] for i in range(90)]
#initialize itmin and itmax
itmin = list[0][:]
itmax = list[0][:]
#propagation
for j in range(3):
for i in range(len(list)):
itmax[j]=max(itmax[j],list[i][j])
itmin[j]=min(itmin[j],list[i][j])
print itmax
print itmin
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