N = int(input())
src = [input() for i in range(N)]
ctr = [0] * 1005
for s in src:
    ctr[len(s)-2] += 1
ans = None
c = 0
for i in range(1004,-1,-1):
    if ctr[i] > c:
        c = ctr[i]
        ans = i
print(ans)