q\L f üÊñÊÌÌÊ
Try it
q\L f üÊñÊÌÌÊ :Implicit input of string U e.g., "()<>a+/sentence$#@(@with::many---_symbols{}|~~" q :Split on \L : Regex /[^a-z]/i ["","","","","a","","sentence","","","","","with","","many","","","","symbols","","","","",""] f :Filter (remove empty strings) ["a","sentence","with","many","symbols"] ü :Group & sort by Ê : Length [["a"],["with","many"],["symbols"],["sentence"]] ñ :Sort by Ê : Length [["a"],["symbols"],["sentence"],["with","many"]] Ì :Last element ["with","many"] Ì :Last element "many" Ê :Length 4
