hist = {}
while line = gets do
  n = line.to_i
  if hist.include? n
    hist[n] += 1
  else
    hist[n] = 1
  end
end
hist = hist.sort{|(k1, v1), (k2, v2)| v2 <=> v1}
keys = []
0.step(hist.length - 2) do |i|
  keys.push hist.to_a[i][0]
  break if hist.to_a[i][1] != hist.to_a[i + 1][1]
end
keys.sort!
keys.each do |i|
  puts i
end