L1 = ['Hello', 'World', 18, 'Apple', None]
L2 = []
for i in L1:
if isinstance(i, str):
L2.append(i)
print([s.lower() for s in L2])
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L1 = ['Hello', 'World', 18, 'Apple', None]
L2 = []
for i in L1:
if isinstance(i, str):
L2.append(i)
print([s.lower() for s in L2])