import algorithm, sequtils, strutils
let
  n: int = stdin.readline.parseInt
  s: seq[string] = mapIt(0..<n, stdin.readline)
var cnt: array[1001, int]
for i in 0..<n:
  cnt[s[i].len - 2].inc
cnt.reverse
var ans = 1000 - cnt.find(max(cnt))
echo ans