Compress a string such that 'AAABCCDDDD' becomes 'A3BC2D4'. Only compress the string if it saves space.

Constraints

Can we assume the string is ASCII?
- Yes
- Note: Unicode strings could require special handling depending on your language
Is this case sensitive?
- Yes
Can we use additional data structures?
- Yes
Can we assume this fits in memory?
- Yes

Name		Name	Last commit message	Last commit date
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__pycache__		__pycache__
test		test
README.md		README.md
build.py		build.py
build.pyc		build.pyc