Buggy python submission (verdict: Time Limit Exceeded):
# coding:utf-8

import sys
import math
import time
import numpy as np
import collections
from collections import deque
import queue
import copy

# 最大公約数
def gcd(m,n):
  x = max(m,n)
  y = min(m,n)
  if x%y == 0:
    return y
  else:
    while x%y != 0:
      z = x%y
      x = y
      y = z
    else:
      return z

# 幅優先探索(BFS)でスタート座標(x, y)からの最大距離返す
def bfs(SS, x, y, H, W):#入力(座標系(迷路), x, y, xの端, yの端)
  x_next = [0, 0, -1, 1]
  y_next = [1, -1, 0, 0]
  tempx = x
  tempy = y
  mlength = 0
  q = deque()
  xytuple = (x, y, 0)
  q.append(xytuple)


  while q:
    xytuple = q.popleft()
    SS[xytuple[0]][xytuple[1]] = "x" #探索した場所は探索できないようにする
    for i in range(4): #このforで上下左右を調べてる
      tempx = xytuple[0] + x_next[i]
      tempy = xytuple[1] + y_next[i]
      #print(tempx, tempy, xytuple[2])
      #print(S)
      if(0 <= tempx and tempx < H and 0 <= tempy and tempy < W and SS[tempx][tempy] == "."):
        temptuple = (tempx, tempy, xytuple[2]+1)
        SS[temptuple[0]][temptuple[1]] = "x" #探索した場所は探索できないようにする
        mlength = max(mlength, xytuple[2] +1)
        q.append(temptuple)
      #print(q)
  return mlength

def brick(a,n,m,N):#ABC 148
  #n番目以降にmがあるか調べる
  if not m in a[n:]:
    print(N-(m-1))
  else:
    #b = copy.deepcopy(a)
    brick(a,a[n:].index(m),m+1,N)

#X = str(input()).split()
#a = [int(x) for x in input().split()]

N = int(input())
S = []
B = []
for i in range(N):
    S.append(str(input()))

c = collections.Counter(S)

B.append(c.most_common()[0][0])


for i in range(len(c.most_common())-1):
    if(c.most_common()[i][1]==c.most_common()[i+1][1]):
        B.append(c.most_common()[i+1][0])
    else:
        break
B.sort()

for i in range(len(B)):
    print(B[i])


Fixed submission:
# coding:utf-8

import sys
import math
import time
import numpy as np
import collections
from collections import deque
import queue
import copy

# 最大公約数
def gcd(m,n):
  x = max(m,n)
  y = min(m,n)
  if x%y == 0:
    return y
  else:
    while x%y != 0:
      z = x%y
      x = y
      y = z
    else:
      return z

# 幅優先探索(BFS)でスタート座標(x, y)からの最大距離返す
def bfs(SS, x, y, H, W):#入力(座標系(迷路), x, y, xの端, yの端)
  x_next = [0, 0, -1, 1]
  y_next = [1, -1, 0, 0]
  tempx = x
  tempy = y
  mlength = 0
  q = deque()
  xytuple = (x, y, 0)
  q.append(xytuple)


  while q:
    xytuple = q.popleft()
    SS[xytuple[0]][xytuple[1]] = "x" #探索した場所は探索できないようにする
    for i in range(4): #このforで上下左右を調べてる
      tempx = xytuple[0] + x_next[i]
      tempy = xytuple[1] + y_next[i]
      #print(tempx, tempy, xytuple[2])
      #print(S)
      if(0 <= tempx and tempx < H and 0 <= tempy and tempy < W and SS[tempx][tempy] == "."):
        temptuple = (tempx, tempy, xytuple[2]+1)
        SS[temptuple[0]][temptuple[1]] = "x" #探索した場所は探索できないようにする
        mlength = max(mlength, xytuple[2] +1)
        q.append(temptuple)
      #print(q)
  return mlength

def brick(a,n,m,N):#ABC 148
  #n番目以降にmがあるか調べる
  if not m in a[n:]:
    print(N-(m-1))
  else:
    #b = copy.deepcopy(a)
    brick(a,a[n:].index(m),m+1,N)

#X = str(input()).split()
#a = [int(x) for x in input().split()]

N = int(input())
S = []
B = []
for i in range(N):
    S.append(str(input()))

c = collections.Counter(S)
a = c.most_common()


B.append(a[0][0])

for i in range(len(a)-1):
    if(a[i][1]==a[i+1][1]):
        B.append(a[i+1][0])
    else:
        break
B.sort()

for i in range(len(B)):
    print(B[i])