I want to know the answer to the following question:
What did Cyril and Mehodius come up with to help with the issue of the Slaves not having a written language?
All the background I'm provided with is that "Prince Rastislav of Moravia had requested the Emperor to provide teachers to interpret the holy scriptures, so in 863 the brothers Cyril and Methodius were sent as missionaries, due to their knowledge of the Slavonic language.". Is that enough to answer the question?
Answer: no