Classify the animal in the following sentence as either mammal, bird, reptile or fish.
Output the correct category of the animal.
The shark swam in the sea.
Fish
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the animal in the following sentence as either mammal, bird, reptile or fish.
Output the correct category of the animal.

### Input:
The shark swam in the sea.

### Output:
Fish