yukicoder :: Int -> [Char]
yukicoder 1 = ['y']
yukicoder 2 = ['u']
yukicoder 3 = ['k']
yukicoder 4 = ['i']
yukicoder 5 = ['c']
yukicoder 6 = ['o']
yukicoder 7 = ['d']
yukicoder 8 = ['e']
yukicoder 9 = ['r']
yukicoder _ = []

main :: IO ()
main = do
  xs <- init . map (read :: String -> Int) . words <$> getContents
  putStr $ unlines $ map yukicoder xs