I have a list of DNA sequences in file A (fasta format) and another list of sequences in file B. There are nearly 200 sequences in file A (average length is 300 bp) and 1300 sequences in file B (average length is the same). I would like to compare these two files and get those kmers, which are enriched in sequences from file A (in comparison with the sequences in file B). How should I do it? Is there any software, with which I can do this type of analysis?