from functools import reduce

def sum_of_ints(values):
    return reduce(lambda x,y: x + y if type(y) == int else x, values, 0)

def flatten_list1(vals):
    res = []
    for val in vals:
        if type(val) == list:
            res.extend(flatten_list1(val))
        else:
            res.append(val)
    return res

def flatten_list2(vals):
    return flatten_list1(vals)

def get_first_column(matrix):
    return [row[0] for row in matrix]

def get_nth_column(n, matrix):
    return [row[n-1] for row in matrix]

def get_all_columns(matrix):
    return [get_nth_column(i+1, matrix) for i in range(len(matrix[0]))]

def scalar_product(vec1, vec2):
    return sum(map(lambda pair: pair[0] * pair[1], zip(vec1, vec2)))

def matrix_square(matrix):
    new_matrix = []
    for row in matrix:
        new_row = []
        for i in range(len(row)):
            new_row.append(scalar_product(row, get_nth_column(i+1, matrix)))
        new_matrix.append(new_row)
    return new_matrix