Change each of the adjectives in the given sentence to its antonym.
The tall and friendly professor held a lengthy discussion.
The short and unfriendly professor held a brief discussion.
Complete the following task based on the instruction and optional input provided.### Instruction:
Change each of the adjectives in the given sentence to its antonym.

### Input:
The tall and friendly professor held a lengthy discussion.

### Output:
The short and unfriendly professor held a brief discussion.