Map reduce Flow clarification

[#1]

Which one will occur first in MapReduce Flow among shuffling and sorting?

To my knowledge shuffling will occur first and then Sorting? Correct me I am wrong.

Any body can explain these two things?

Below statement from the Definative guide:

MapReduce makes the guarantee that the input to every reducer is sorted by key. The process by which the system performs the sort—and transfers the map outputs to the reducers as inputs—is known as the shuffle.

[#2]

Hi experts

Anybody Input on my mail?