The user input get's eval()ed, but the **globals** keyword is blocked. We can therefore use eval to concatenate 'glob' + 'als' to bypass the filter:
```eval('glob' + 'als()')```
Scrolling down we can see the flag in one of the variables: 'maybe_this_maybe_not': 'DUCTF{3v4L_1s_D4ng3r0u5}'