15
367
+ a b
+ - a b c
+ a - b c
* + a b c
* a + b c
+ * a b c
+ a * b c
+ - a 13 b
+ a - 13 c
/ 3 - * x y + u 4
+ / + * a b c a * x 3
+ / a b * x y 
+ + / / a b c d e
* - + a b / 7 2 * s t


Correct output:
---------------
367
367

+ a b
a + b

+ - a b c
a - b + c

+ a - b c
a + (b - c)

* + a b c
(a + b) * c

* a + b c
a * (b + c)

+ * a b c
a * b + c

+ a * b c
a + b * c

+ - a 13 b
a - 13 + b

+ a - 13 c
a + (13 - c)

/ 3 - * x y + u 4
3 / (x * y - (u + 4))

+ / + * a b c a * x 3
(a * b + c) / a + x * 3

+ / a b * x y 
a / b + x * y

+ + / / a b c d e
a / b / c + d + e

* - + a b / 7 2 * ss tt
(a + b - 7 / 2) * (s * t)