Hidden in each of the following names is a world capital. The letters are in the correct left-to-right order, but are not consecutive. Can you find the hidden cities?

1. BORIS KARLOV
2. FRANK SINATRA
3. STEVEN DOUGLAS
4. LEONARDO DA VINCI

Answers:

1. OSLO
2. ANKARA
3. SEOUL
4. LONDON 

Credit:
NPR Weekend Edition Sunday Puzzle
November 1, 2009
Will Shortz