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Number of sides on a polygon

## Input
- The name of a polygon.
- You are only required to handle inputs listed in the test cases.

## Output
- The number of edges the polygon has.

## Test cases
Test cases are in the format `input : output`.

```txt
triangle : 3
trigon : 3
quadrilateral : 4
quadrangle : 4
tetragon : 4
rectangle : 4
square : 4
rhombus : 4
parallelogram : 4
kite : 4
trapezium : 4
pentagon : 5
hexagon : 6
heptagon : 7
septagon : 7
octagon : 8
enneagon : 9
nonagon : 9
decagon : 10
hendecagon : 11
undecagon : 11
dodecagon : 12
triskaidecagon : 13
tridecagon : 13
tetrakaidecagon : 14
tetradecagon : 14
pentakaidecagon : 15
pentadecagon : 15
hexakaidecagon : 16
hexadecagon : 16
heptakaidecagon : 17
heptadecagon : 17
octakaidecagon : 18
octadecagon : 18
enneakaidecagon : 19
enneadecagon : 19
icosagon : 20
```

## Scoring
This is a [code golf challenge]. Your score is the number of bytes in your code. Lowest score for each language wins.

> Explanations are optional, but I'm more likely to upvote answers that have one.


[code golf challenge]: https://codegolf.codidact.com/categories/49/tags/4274 "The code-golf tag"