insert ACGT     
    


 insert            AAAA   
 insert AA
insert                 AAACCCCGGTGAAAACGTA
insert       ACTGGGAA          

remove       ACGT         

insert ACCTT
insert ACTTA
 
 print
 
 insert TATA
 insert TCG
 
 print lengths
 print stats
 
 search         AAAA$
                         search     AA
 search      ACGT$