I’m trying to learn the cube but I'm stuck. How can I solve this in the least number of moves?

[![front](https://i.stack.imgur.com/6w2Of.jpg)](https://i.stack.imgur.com/6w2Of.jpg)

[![posterior](https://i.stack.imgur.com/iqQSo.jpg)](https://i.stack.imgur.com/iqQSo.jpg)

The answer is a phrase. Since it’s a secret phrase, an abbreviation will do.