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with collections.Counter solution in Clear category for Most Wanted Letter by Phil15
from collections import Counter
def most_wanted(text: str) -> str:
c = Counter(ch.lower() for ch in text if ch.isalpha())
max_count = c.most_common(1)[0][1]
return [ch for ch, count in c.items() if count==max_count]
Aug. 30, 2018