sh_txt = data['sh_txt']
shifr = ''
shifr += sh_txt
shifr.replace('А', "Г")
shifr.replace('а', 'г')
shifr.replace('Б', "Д")
shifr.replace("б", "д")
shifr.replace("В", "Е")
.............................
#и так далее
await msg.answer(f'{shifr}', reply_markup=gens)
shifr = shifr.replace('А', "Г")