British

import random
import copy
import re


def prepare_to_british_scientists(text, letters_to_shuffle_nm):
    for word in re.findall(r'\w+', text):
        line = list(word)
        if len(line) > 2:
            del line[0]
            del line[len(line) - 1]
            shuf = []
            index = 0
            to_change = min(letters_to_shuffle_nm, len(line))
            while index < to_change:
                letter = random.randint(0, len(line) - 1)
                if letter not in shuf:
                    shuf.append(letter)
                    index += 1
            line1 = copy.copy(line)
            for i in range(to_change):
                line1[shuf[i]] = line[shuf[(i + 1) % (to_change)]]
            res = word[0]
            for i in range(len(line1)):
                res += line1[i]
            res += word[-1]
            text = text.replace(word, res)
    return text