from itertools import combinations
def filler(A, l):
    n = len(l)
    result = list()
    for i in range(1, n+1):
        for comb in combinations(l, i):
            if (sum(comb) == A):
                result.append(comb)
    return result if len(result) > 0 else "None"

# Example:
print(filler(10, [1, 2, 3, 4]))