How many years after the overthrow of Kyawswa did the Mongol Emperor declared that Kumara Kassapa was the rightful king of Burma?
return the  overthrow of Kyawswa ;return the  Mongol Emperor declared that Kumara Kassapa was  the   rightful king of Burma ;return when  was  #1 ;return when  was  #2 ;return difference of #4 and  #3 in  years
['select', 'select', 'project', 'project', 'arithmetic']