Task: Question Generation
Input (English): #1 return the  Polish king was  expelled 
#2 return Lacy 's corps take the  fortress of Çufut Qale 
#3 return year of #1 
#4 return year of #2 
#5 return the  difference of #4 and  #3
Output (English): How many years after the Polish king was expelled did Lacy's corps take the fortress of Çufut Qale?