#!/usr/bin/env python
# -*- coding: utf-8 -*-

__author__ = 'Sergey Sobko'
__email__ = 'S.Sobko@profitware.ru'
__copyright__ = 'Copyright 2014, The Profitware Group'


def nucleobase_yielder():
    while True:
        yield 'A'
        yield 'A'
        yield 'U'
        yield 'G'


rna_new_state = {
    'AUG': 'READING_TRIPLETS',
    'UAA': 'STOP_CODON',
    'UAG': 'STOP_CODON',
    'UGA': 'STOP_CODON'
}


def get_triplets_and_states(nucleobase_list=None):
    if nucleobase_list is None:
        return
    state = 'TRYING_TO_FIND_START_CODON'
    all_nucleobases = list()
    all_nucleobases_current_position = 0
    remainder = 0
    last_triplet = None
    for nucleobase in nucleobase_yielder():
        all_nucleobases.append(nucleobase)
        all_nucleobases_current_position += 1
        if state == 'READING_TRIPLETS' and all_nucleobases_current_position % 3 != remainder:
            continue
        if len(all_nucleobases) > 2:
            last_triplet = all_nucleobases[all_nucleobases_current_position - 3:]
            maybe_new_state = rna_new_state.get(''.join(last_triplet))
            if maybe_new_state:
                if state == 'TRYING_TO_FIND_START_CODON' and maybe_new_state == 'READING_TRIPLETS':
                    remainder = all_nucleobases_current_position % 3
                state = maybe_new_state
        if len(all_nucleobases) > 100:
            break
        if last_triplet and state:
            yield ''.join(last_triplet), state
        if state == 'STOP_CODON':
            break
    return


def main():
    for triplet, state in get_triplets_and_states(nucleobase_list=nucleobase_yielder()):
        print triplet, state

if __name__ == '__main__':
    main()