import sys
import re
import random


def prepare_to_british_scientists(text, letters_to_shuffle_nm):
    def count(match):
        line = match.group(0)
        if(len(line) <= 3):
            return line
        changing = min(letters_to_shuffle_nm, len(line) - 2)
        mylist =[s for s in line[1:1+changing]]
        random.shuffle(mylist)
        return line[0] + ''.join(mylist) + line[1+changing:]
    a = re.sub(r'[a-zA-z]+|[а-яА-Я]+', count , text)
    return a