n = int(input())
eye_dic = {}
max_eye = 0
max_count = 0

for i in range(n):
    eye = len(input())-2
    eye_dic.setdefault(eye,0)
    eye_dic[eye] += 1
    if eye_dic[eye]>max_count:
        max_count = eye_dic[eye]
        max_eye = eye
    elif eye_dic[eye]==max_count:
        max_eye = max(max_eye,eye)
print(max_eye)