Input (grade 10): Muawiyah marched to Kufa, where he persuaded a number of Ali's supporters to acclaim him as caliph instead of Ali's son, Hasan.
Output (grade 12): When Ali was assassinated in 661, Muawiyah marched to Kufa There he persuaded a number of Ali's supporters to accept him as caliph instead of Ali's son, Hasan.