# web/flaglang (606 solves)> Do you speak the language of the flags?
Looking at Flaglang it is a plain website where we can select countries and see 'Hello world' in various languages, at the very top is an interesting option, Flagistan.
![flaglang-1.png](https://seall.dev/images/ctfs/lactf2024/flaglang-1.png)
Looking at the source code provided we can see that the countries are stored in YAML and the country 'Flagistan' seems to deny all country codes.
Scrolling through the YAML I notice that 'NO' for Norway is highlighted blue.
![flaglang-2.png](https://seall.dev/images/ctfs/lactf2024/flaglang-2.png)
YAML seems to parse YES/NO as objects like true/false rather than strings, so we can cause the server to load an invalid object (which isn't on Flagistans deny list), allowing us to render the flag!
![flaglang-3.png](https://seall.dev/images/ctfs/lactf2024/flaglang-3.png)
Bam! We can see the flag!
Flag: `lactf{n0rw3g7an_y4m7_f4ns_7n_sh4mbl3s}`