CLS
  DIM N AS STRING * 2
  NO$ = "NO"
  A$ = "(": B$ = ")": C$ = "[": D$ = "]"
 OPEN "INPUT.TXT" FOR INPUT AS #1
 OPEN "OUTPUT.TXT" FOR OUTPUT AS #2
  
DO WHILE (EOF(1))
       INPUT #1, N
       IF N = A$ + A$ THEN WRITE #2, NO$
       IF N = A$ THEN WRITE #2, A$ + B$
       IF N = B$ THEN WRITE #2, A$ + B$
       IF N = C$ THEN WRITE #2, C$ + D$
       IF N = D$ THEN WRITE #2, A$ + B$
LOOP
        
 CLOSE #2
 CLOSE #1

SYSTEM