word = "курсор"
word_lst = list(word)
word_lst[0] = "т"
word_lst[1] = "а"
word_lst[2] = "н"
word_lst[3] = "ц"
print(''.join(map(str, word_lst)))
word = "курсор"
word_lst = list(word)
word_lst[0] = "т"
word_lst[1] = "а"
word_lst[2] = "н"
word_lst[3] = "ц"
print(''.join(map(str, word_lst)))