def merge_the_tools(string, k):
    u, t = '', ''
    for i in string:
        t += i
        if i not in u:
            u += i
        if len(t) == k:
            print(u)
            t = u = ''
`

if __name__ == '__main__':

def merge_the_tools(string, k):
    # your code goes here
    for i in range(0, len(string), k):
        substring = string[i: i + k]
        seen = set()
        result = ""
        for ch in substring:
            if ch  not in seen:
                seen.add(ch)
                result += ch
        print(result)

def merge_the_tools(s: str, k: int):
    # iterate over substrings
    for i in range(0, len(s), k):
        # temp string
        result = ""
        # iterate over chars in substring
        for j in s[i:i + k]:
            if not j in result:
                # add char if not present
                result = result + j
        print(result)

def merge_the_tools(string: str, k: int):
    length: int = len(string)

    for i in range(0, length, k):
        result: list[str] = []
        for char in string[i : i + k]:
            if char not in result:
                result.append(char)

            print("".join(result))


if __name__ == "__main__":
    string, k = input(), int(input())
    merge_the_tools(string, k)