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 "The Slavs had no written language, so the brothers devised the Glagolitic alphabet, later developed into Cyrillic, and standardized the language of the Slavs, later known as Old Church Slavonic.". Is that enough to answer the question?
Answer: yes