l = [10,20,30,40,50]
print(l)
print(l[0])
print(l[1])
print(l[0:3])
print(l[-1])
print(l[::-1])
print(l.count(10))
l.insert(2, 25)
print(l)
l.append(60)
print(l)
l.extend([70,90,80])
print(l)
l.pop()
print(l)
l.reverse()
print(l)
l.sort()
print(l)
l.sort(reverse = True)
print(l)
