generator

import random

for y in range(0, 100):
    res = []
    leng = random.choice(range(3, 16, 2))
    opened = 0
    for t in range(leng):
        if t % 2 == 0:
            if t == 0 or res[-1] == '(':
                res += [random.randint(-100, 100)]
            else:
                res += [random.randint(0, 100)]
        else:
            if opened > 0 and random.randint(0, 100) > 60:
                res += ')'
                opened -= 1
                if t != leng - 1:
                    res += random.choice(['-', '+', '*', '/'])
                continue

            res += random.choice(['-', '+', '*', '/'])
            if opened == 0 and random.randint(0, 100) > 70:
                res += '('
                opened += 1

    for t in range(opened):
        res += ')'
    for i in res:
        print(i, end='')
    print()