Currency is also kind of merchandise.
According to the theory of supply and demand,
the more you have, the lower the price will be.

Now come to your question.
LAT and EURO.

If you want to break the balance between LAT and EURO, and want LAT to be appreciated.
The basic method is to increase EURO's supply amount.
That's why the nation purchase EURO.

Now, here is the question,
how could they long the EURO?

Printing your local currency is a method,
international trade is another way,
or just borrow in the foreign currency.

In summary,
the key here is to increase the other currency's supply not "printing local currency".

I hope this helps.

??????good job