question_text: How many days after the Soviet 11th Red Army's invasion of the First Republic of Armenia started did  Garegin Nzhdeh declare Syunik as a self-governing region?
decomposition: return day when  the  Soviet 11th Red Army 's invasion of the First Republic of  Armenia started ;return day when  Garegin Nzhdeh declares Syunik as a self-governing region ;return the  difference of #2 and  #1