def merge_the_tools(string, k):
# while loop runs till the string becomes empty
while string:
    # splice the given string
    s = string[0:k]
    # initiate an empty string
    # (seen is just the name of our variable)
    seen = ''
    # run a for loop through our spliced string (s),
    # appending only unique characters to our variable seen
    for c in s:
        if c not in seen:
            seen += c
    print(seen)
    # remove the spliced part from original string for the next iteration
    string = string[k:]