import strformat,strutils

import osproc
var p = 0
if execCmdEx("test -f hoge").exitCode == 0:
  p = execProcess("cat hoge").strip().parseInt()
  discard execProcess(fmt"echo {p + 1} > hoge")
else:
  discard execProcess("echo 0 > hoge")

# (000 ～ 999)
if p < 5:
  for i in 0..999:
    echo fmt"{i:03d}"
    if stdin.readLine() == "unlocked": break
else:
  for i in countdown(999,0):
    echo fmt"{i:03d}"
    if stdin.readLine() == "unlocked": break