it_companies=[]
print(it_companies)
f="facebook"
g="Google"
m="Microsoft"
a="Apple"
i="IBM"
o="Oracle"
am="Amazon"
it_companies.insert(0,f)
it_companies.insert(1,g)
it_companies.insert(2,m)
it_companies.insert(3,a)
it_companies.insert(4,i)
it_companies.insert(5,o)
it_companies.insert(6,am)
print(it_companies)
it_companies2=[]
it_companies2=[am,o,i,a,m,g,f]
print(it_companies2)
print("El número de empresas que hay en la lista es de:")
print(len(it_companies))
print("La primera empresa es:")
print(it_companies[0])

print("La media empresa es:")
print(it_companies[3])

print("La ultima empresa es:")
print(it_companies[6])

it_companies.pop(3)
it_companies.insert(3,"Samsung")
print(it_companies)
it_companies.insert(4,"Acer")
print(it_companies)
it_companies.insert(4,"Motorola")
print(it_companies)