Virtually all countries have 3 letters in their names.
Afghanistan.
There are no countries that have only 3 letters.
Afghanistan.
Canada
BAHAMAS
In the Olympics, each participating country is designated by a 3-digit code. The letters SUI represent Switzerland.
The initials SLO refer to the Olympic country code for the country of Slovenia. The first three letters are used to identify a country with a unique 3 letter code. In some cases the code may not be the first three letters but a subset of letters in the country's name.
Elx is a city in Spain
The country with the letters "newsed" is Sweden.
Czech Republic is a country. It has 13 letters.
No country has all of those letters in a single name.
No country in Europe begins with the letters "To-". Togo is the only country that begins with the letters To. Togo is in Africa.