d = dict()
for _ in range(int(input())):
book = input()
if book in d:
d[book] += 1
else:
d[book] = 1
m = max(d.values())
candi = []
for k, v in d.items():
if v == m:
candi.append(k)
print(sorted(candi)[0])
# candi.sort()
# print(candi[0])
