N = gets.to_i
SIZE = 1000
eyes = Array.new(SIZE, 0)
(1..N).each do
  s = gets.chomp.size - 2
  eyes[s] += 1
end
max_eye = 0
last_index = 0
(0..SIZE - 1).each do |index|
  eye = eyes[index]
  eye < max_eye and next
  max_eye = eye
  last_index = index
end
puts last_index