Task: Pos Tagging
Input (English): Sentence: It is widely acknowledged that the Pakistani ISI has nurtured a number {{ of }} extremist Islamist groups , such as the Harkat - ul - Jehad - al - Islami , in the port city of Chittagong , and put a number of secessionist rebels from India 's northeast in touch with this terrorist network . 
Word: of
Output (English): IN