REM Задача №1
CLS
OPEN "input.txt" FOR INPUT AS #1
OPEN "output.txt" FOR OUTPUT AS #2
INPUT #1, s$
FOR i = 1 TO LEN(s$)
s1$ = MID$(s$, i, 1)
IF s1$ = "(" THEN
n1 = n1 + 1
IF MID$(s$, i + 1, 1) = "(" THEN k = 1
END IF
IF s1$ = ")" THEN
n2 = n2 + 1
IF MID$(s$, i + 1, 1) = ")" THEN l = 1
END IF
IF s1$ = "[" THEN
p1 = p1 + 1
IF MID$(s$, i + 1, 1) = "[" THEN t = 1
END IF
IF s1$ = "]" THEN
p2 = p2 + 1
IF MID$(s$, i + 1, 1) = "]" THEN z = 1
END IF
NEXT i
n = 1
IF n2 = n1 AND LEFT$(s$, 1) = ")" AND RIGHT$(s$, 1) = "(" THEN s2$ = "(" + s$ + ")"
IF p2 = p1 AND LEFT$(s$, 1) = "]" AND RIGHT$(s$, 1) = "[" THEN s2$ = "[" + s$ + "]"

IF n2 > n1 THEN
FOR i = 1 TO n2 - n1
s2$ = s2$ + "("
NEXT i
s2$ = s2$ + s$
n = 0
END IF
IF n1 > n2 THEN
IF n = 1 THEN s2$ = s2$ + s$
FOR i = 1 TO n1 - n2
s2$ = s2$ + ")"
NEXT i
n = 0
END IF
IF p2 > p1 THEN
FOR i = 1 TO p2 - p1
s2$ = s2$ + "["
NEXT i
IF n = 1 THEN s2$ = s2$ + s$
n = 0
END IF
IF p1 > p2 THEN
IF n = 1 THEN s2$ = s2$ + s$
FOR i = 1 TO p1 - p2
s2$ = s2$ + "]"
NEXT i
END IF
IF n1 + n2 + p1 + p2 <> LEN(s$) THEN s2$ = "NO"
IF (n1 > 1 AND n2 = 0 AND k = 1 AND p1 = p2) OR (n2 > 1 AND n1 = 0 AND l = 1 AND p1 = p2) THEN s2$ = "NO"
IF (p1 > 1 AND p2 = 0 AND t = 1 AND n1 = n2) OR (p2 > 1 AND p1 = 0 AND z = 1 AND n1 = n2) THEN s2$ = "NO"
PRINT #2, s2$
CLOSE #1
CLOSE #2
SYSTEM