```pythonfrom pwn import *
def depth(s):    cnt=0    while(len(s)!=0):        s=s.replace('()','')        cnt+=1    return cntdef calc(s1,s2):    d1=depth(s1)    d2=depth(s2)    if d1==d2:        return s1+s2    if d1<d2:        return "(%s%s)"%(s1,s2[1:-1])    if d1>d2:        return "(%s%s)"%(s1[1:-1],s2)solve = lambda x:reduce(calc,x.replace(" ",'').split('+'))
host = '2018shell2.picoctf.com'port = 61344r=remote(host,port)while True:	try:		lines=r.recvuntil('\n>').split('\n')		print '\n'.join(lines)		din=lines[-3].split('=')[0]		r.sendline(solve(din))	except:		print r.recv()		breakr.close()```