Check09.hs:4:1:
    Prelude: Can't be safely imported!
    The package (base-4.7.1.0) the module resides in isn't trusted.

Check09.hs:5:1:
    Data.ByteString.Char8: Can't be safely imported!
    The package (bytestring-0.10.4.0) the module resides in isn't trusted.