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n=int(input())
dic={}
for i in range(n):
    put=input().split()
    pp=(int(put[2][0:2])-int(put[1][0:2]))*3600+(int(put[2][3:5])-int(put[1][3:5]))*60+(int(put[2][6:])-int(put[1][6:]))
    if put[0] not in dic:
        dic[put[0]]=pp
    else:
        dic[put[0]]+=pp
print(sorted(dic.items(),key=lambda items:-items[1])[0][0])