You can try to use the two for approach
z = ["for", "core", "end"]
letters = []
for word in z:
for element in word:
letters.append(element)
print(letters)
#['f', 'o', 'r', 'c', 'o', 'r', 'e', 'e', 'n', 'd']
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solved I have a list, how can I split words in list to get each letter from list [closed]