Categorize the following fruits based on their color.
Apple, Grape, Watermelon
Red: Apple
Green: Grape, Watermelon (the outside rind)
Pink/Red: Watermelon (the inside flesh)
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize the following fruits based on their color.

### Input:
Apple, Grape, Watermelon

### Output:
Red: Apple
Green: Grape, Watermelon (the outside rind)
Pink/Red: Watermelon (the inside flesh)