local n = io.read("*n", "*l")
local t = {}
for i = 1, n do
  local s = io.read()
  local key = #s - 2
  if(t[key] == nil) then t[key] = 1 else t[key] = t[key] + 1 end
end
local kmax, vmax = 0, 0
for k, v in pairs(t) do
  if(vmax < v) then kmax, vmax = k, v
  elseif(vmax == v and kmax < k) then kmax = k
  end
end
print(kmax)