Triple keys generation

import random

def i3_statement(lvls):

    lvls = [random.randint(0, 199) for i in range(3)]
    istatement = lambda x: (65**x) % 839
    o_keys = tuple(istatement(lvl) for lvl in lvls)
    rez = ''.join([str(lv).rjust(3,'0') for lv in o_keys])
    return rez, lvls

def i3post_statement(o_kyes, skeys):

    ipost_statement = lambda ml, lv: (ml**lv) % 839
    o_kyes = [int(o_kyes[i:i + 3]) for i in range(0, len(o_kyes), 3)]
    keys = [ipost_statement(o_kyes[i],skey) for i, skey in enumerate(skeys)]
    rez = ''.join([str(k).rjust(3,'0') for k in keys])
    return rez

def main():

    oc_keys, sc_keys = i3_statement(sc_keys)
    os_keys, ss_keys = i3_statement(ss_keys)

    s_value = i3post_statement(oc_keys, ss_keys)
    c_value = i3post_statement(os_keys, sc_keys)

    print s_value, c_value


if __name__ == '__main__':
    main()