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a = [(1,2),(3,4),(3,7),(8,4),(5,6)]
min([k for k,v in a])
min([v for k,v in a])
max([k for k,v in a])
max([v for k,v in a])
a = [(1,2),(3,4),(3,7),(8,4),(5,6)]
b = []
c = []
for k,v in a:
b.append(k)
c.append(v)
b_min = min(b)
c_min = min(c)
b_max = max(b)
c_max = max(c)
print b_min
print c_min
print b_max
print c_max
a = [(1,2),(3,4),(3,7),(8,4),(5,6)]
b = []
c = []
for k,v in a:
b.append(k)
c.append(v)
b.sort()
c.sort()
b_min = b[0]
c_min = c[0]
b.reverse()
c.reverse()
b_max = b[0]
c_max = c[0]
print b_min
print c_min
print b_max
print c_max