def load_data(file_name: str = 'sample1') -> list:
    """
    Loads example
    :param file_name: file name of example
    :return: list loaded data
    """
    date = ''
    file = open(file_name)
    try:
        date = file.readlines()
    except:
        print("Zły format pliku !")
    finally:
        file.close()
    matrix = []
    for line in date[1:]:
        matrix.append(line.strip().split()[:])
    return matrix