def unique_in_order(iterable):
    x = []
    [x.append(item) for item in iterable ]
    k = []
    i = 0
    while i < len(x)-1:
        if x[i+1] != x[i]:
            k.append(x[i])
        i +=1
    print(k)
 	return k
 
unique_in_order('AAAABBBCCDAABBB')