%hash = (a=>2, b=>1, c=>5, d=>3, e=>4); $input = "abcdaeec"; $calculate = $i+($i+n) of $input; #where n = 2 or 3 (sliding window:- #like a+c b+d c+a d+e a+e e+c 2+5 1+3 5+2 3+4 2+4 4+5) prints= 7 4 7 7 6 9