Iterables and Iterators

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    import itertools List=[] count = 0 n = int(input()) l = input().split(" ") k = int(input()) for i in range(len(l)): if(l[i]=="a"): List.append(i+1) comb = list(itertools.combinations([i+1 for i in range(len(l))],k)) for i in comb: for j in List: s="" if(j in i): s+=" " if(len(s)>=1): count+=1 break print(count/len(comb))