How many days after the Treaty of Brest-Litovsk was signed did General Mannerheim resign?
return the  Treaty of Brest-Litovsk was  signed ;return General Mannerheim did resign ;return when  was  #1 ;return when  was  #2 ;return difference of #3 and  #4 in  days
['select', 'select', 'project', 'project', 'arithmetic']