def get_len(arr):
    for seq_len in range(len(arr), 0, -1):
        for start in range(len(arr)-seq_len+1):
            stop = start + seq_len
            if sum(arr[start:stop]) == 0:
                return seq_len, arr[start:stop]
    return 0, []

if __name__ == '__main__':
    arr1 = [15, -2, 2, -8, 1, 7, 10, 23]
    arr2 = [1, 2, 3]
    arr3 = [1, 0, 3]
    print(get_len(arr1))
    print(get_len(arr2))
    print(get_len(arr3))