import textwrap
from collections import OrderedDict

def merge_the_tools(s, k):
    chunks = textwrap.wrap(s, k)
    for c in chunks:
        print("".join(OrderedDict.fromkeys(c)))

def main():
    s, k = input(), int(input())
    merge_the_tools(s, k)
    
if __name__ == "__main__":
    main()