Restore the text to its original form by removing all of the grammatical mistakes.
This river is the longest river in The World
This river is the longest in the world.
Complete the following task based on the instruction and optional input provided.### Instruction:
Restore the text to its original form by removing all of the grammatical mistakes.

### Input:
This river is the longest river in The World

### Output:
This river is the longest in the world.