LastWord←{
     ' '∊⍺:⎕NULL
     ⎕IO←0
     words←' '(≠⊆⊢)⍵
     matches←(⍺ ⎕S'%')words
     {⊃⌽⍵⌿⍨×≢¨⍵}matches ⍝ Last Matching Word
 }