def solution(participant, completion):
participant.sort()
completion.sort()
n = len(participant)
for i in range(n-1) :
if participant[i] != completion[i] :
return participant[i]
return participant[n-1]
#print(solution(["leo", "kiki", "eden"], ["eden", "kiki"]))
print(solution(["marina", "josipa", "nikola", "vinko", "filipa"],["josipa", "filipa", "marina", "nikola"]))
#print(solution(["mislav", "stanko", "mislav", "ana"],["stanko", "ana", "mislav"]))