Answer:
Follow step by step explabation to get answer to the question and also see attachments for output.
Explanation:
code:
def normalize(input_string):
l=list();
for i in input_string:
if (i>='a' and i<='z') or (i>='A' and i<='Z'):
l.append(i.lower())
return l
def find_missing_letters_algorithm(sentence,prevsentece):
l=list();
for i in prevsentece:
i=i.lower();
if i not in sentence:
l.append(i)
return l
print(find_missing_letters_algorithm(normalize("O.K. #1 Python!"),"O.K. #1 Python!"))