boj-1302. 베스트셀러

books = dict()

for _ in range(int(input())):
    name = input()
    if name in books.keys():
        books[name] += 1
    else:
        books[name] = 1

max_profit_books = max(books.values())
arr = []
for k in books.keys():
    if max_profit_books == books.get(k):
        arr.append(k)

arr.sort()
print(arr[0])