list1 = ['I', 'C', 'A', 'N', 'R', 'U', 'N']
list2 = ['I', 'K', 'A', 'N', 'R', 'U', 'T']
changes = [(i, list1[i], list2[i]) for i in range(len(list1)) if list1[i] !=
    list2[i]]
print(changes)
comparing two lists and finding indices of changes