def same_index_values(a,b):
    new_list =[]
    i=0
    while i < len(a):
        if a[i]==b[i]:

            x =a.index(a[i])

            new_list.append(x)

        i+=1

    return new_list

print(same_index_values([1,2,3],[3,2,1]))
print(same_index_values(['a','b','c','d'],['c','b','a','d']))