# -*- coding: UTF-8 -*-
def split_string_with_step(my_string, step):
    """
    create list of strings by split a big one with step
    """
    if (
        not isinstance(my_string, str) or
        not isinstance(step, int)
    ):
        raise NotImplementedError
    pos = 0
    my_list = []
    for char in range((len(my_string)//step)+1):
        my_list.append(my_string[pos:pos+step])
        pos+=step
    if len(''.join(my_list)) == len(my_string):
        return my_list
    else:
        raise NotImplementedError

# ~# example :

my_string_test = """MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5qeHbZZQFLnXoiBrQb8udZxmz3FGnFFd63/qrlQ4GBpbf62DVMVEgZJOJFGEKW09KvgikBHtpRitYvW4g54s2/RVSK+6qpPq+Iw3jHuUrO3rkDW/2J5pcczUaxRQHuRyL9/fm7m9m4JMnFyTXV8Bn7hWrfH2VkVRz2wKd8BzBmMX1alCaVLLTz8NP2ccBO3U9Zyt4ZXPki5SOV3I421F9324y2VVtuqUewAGeYhGjcQ51yKlBggrkp+E1p9dmola7Xw6/UG3DIrgv88NeqAYiYjAfzMRwOjbQA2mhi770kINJKOWL59FbGcFxTcakzfdTljPHxWJy+u5aAoZNZQIDAQAB"""
my_list_of_string = split_string_with_step(my_string_test, 6)

for x in my_list_of_string:
    print(x)