l = list()
res = 0
pl = 0

for i in range(1001):
    l.append(0)

for i in range(int(input())):
    s = input()
    l[len(s)-2] += 1
else:
    for j,lj in enumerate(l):
        if lj >= res and j > pl:
            res = lj
            pl = j
    else:
        print(pl)