{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE BangPatterns #-}

import Control.Applicative
import Control.Monad
import Control.Arrow
import Data.List
import Data.Maybe
import Data.Char
import Text.Printf

import System.IO

readInt = ( readLn :: IO Int )
readInts = map ( read :: String -> Int ) . words <$> getLine

which a b f = if f then a else b
mp [ a, b ] = ( a, b )

main = solve ( 0 :: Int )

solve k = do
	printf "%03d\n" k
	hFlush stdout
	s <- getLine
	when ( s == "locked" ) $
		 solve ( k + 1 )