a_list = list(input())
demo = {}
t = []
for i in range(len(a_list)):
    if a_list[i] == ')':
        for j in range(i-1,-1,-1):
            if a_list[j] == '(' and j not in demo:
                demo[i] = 1
                demo[j] = 1
                break
    if a_list[i] == ']':
        for j in range(i-1,-1,-1):
            if a_list[j] == '[' and j not in demo:
                demo[i] = 1
                demo[j] = 1
                break
for m in range(len(a_list)):
    if m in demo:
        t.append(a_list[m])
    else:
        if a_list[m] == '(' or a_list[m] == ')':
            t.append("()")
        else:
            t.append("[]")
print(''.join(t))