def inSplit(l):
    for i in range(len(l)):
        l[i-1] = int(l[i-1])
    return l

n = int(input())

m = list(input().split(" "))
m = inSplit(m)

p = sum(m)

k = [] # 0 > nyitó z jel, 1 > csuko z jel
a = True
nyit = 0

for i in m:
    if nyit >= int(p / 2):
        print(-1)
        a = False
        break

    if nyit - i >= 0:
        for j in range(i):
            k.append(1)
            nyit -= 1
    else:
        for j in range(i):
            k.append(0)
            nyit += 1

out = ""

for i in k:
    if i == 0:
        out += "("
    else:
        out += ")"
if a:
    print(out)