blob: def9b938321984c5d9ae72434b30c880817c47ff (
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#!/usr/bin/env python
from collections import Counter
def twiceAppearance(str):
count = Counter()
for char in str:
count[char] += 1
if count[char] > 1:
return char
return "␀" # fallback
def solution(str):
print(f'Input: $str = "{str}"')
print(f'Output: "{twiceAppearance(str)}"')
print('Example 1:')
solution("acbddbca")
print('\nExample 2:')
solution("abccd")
print('\nExample 3:')
solution("abcdabbb")
print('\nExample 4:')
solution("abcdefg")
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