import Control.Applicative ((<$>))
import Control.Monad (unless)
import System.IO (hFlush, stdout)

import Text.Printf

main :: IO ()
main = do
  printf "%010d\n" (0::Int)
  hFlush stdout
  [s,rslt] <- words <$> getLine
  unless (rslt == "unlocked") $ solve (read s) 0 1
    

solve :: Int -> Int -> Int -> IO ()
solve mtc ecn d = do
  let nn = ecn + d
  printf "%010d\n" nn
  hFlush stdout
  [s,rslt] <- words <$> getLine
  unless (rslt == "unlocked") $ do
    let nc = read s :: Int
    if nc > mtc then do
      solve nc nn (d * 10)
    else if nc < mtc then do
      solve mtc ecn (d * 10)
    else do
      solve mtc nn d