the numeric value lowercase character define position 1indexed alphabet numeric value 1 numeric value b 2 numeric value c 3 onThe numeric value string consist lowercase character define sum character numeric value for example numeric value string abe equal 1 2 5 8you give integer n k Return lexicographically small string length equal n numeric value equal kNote string x lexicographically small string y x come y dictionary order x prefix y position xi yi xi come yi alphabetic order Example 1input n 3 k 27output aayexplanation the numeric value string 1 1 25 27 small string value length equal 3example 2input n 5 k 73output aaszz Constraints1 n 105n k 26 n