text: import sys
  problem_name = str('input')
  sys.stdout = open("output.txt", "w")
  def unff(number, arr, base):
      res = ""
      while number > 0:
          y = arr[number % base]
          res = y + res
          number = int(number // base)
      return res
  dec_mas = []
  arr = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F']
  f = open(problem_name + ".txt")
  s = []
  for line in f:
      s.append(line)
  for od in range(1, len(s)):
      dec_mas.append(int(s[od]))
  b = int(s[0])
  count = {}
  count = {i: 0 for i in arr}
  for i in dec_mas:
      un = unff(i, arr, b)
      s = []
      for o in un:
          if not(o in s):
              count[o] += 1
              s.append(o)
  maxim = 0
  index = 0
  for i in count:
      if count[i] > maxim:
          maxim = count[i]
          index = i
  print(index)
  