#!/usr/bin/env gosh

(define (char-invert-capt c)
  (if (char-upper-case? c)
      (char-downcase c)
      (char-upcase c))
  )

(define (str-invert-capt str)
  (string-map (^x (char-invert-capt x)) str)
  )

(define (main _)
  (let ([str (read)])
    (display (str-invert-capt (symbol->string str)))
    )
  (newline)
  0)