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def extract_lowercase(s) : length = len(s) lower_s = "" for i in range(length) : if (ord(s[i]) >= 97 and ord(s[i]) <= 122) : lower_s = lower_s + s[i] return lower_s s = "pyPthYTHoOnN" lc = extract_lowercase(s) print(lc) ''' run: python '''