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from collections import Counter
def solution(participant, completion):
dic1=Counter(participant)
dic2=Counter(completion)
answer=dic1-dic2
return list(answer.keys())[0]
from collections import Counter
def solution(participant, completion):
dic1=Counter(participant)
dic2=Counter(completion)
for x in dic1:
if dic1[x]-dic2[x]!=0:
return x
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