import sys
readline=sys.stdin.readline
write=sys.stdout.write

T=readline().rstrip()
L,R=[],[]
for t in T:
    if t=="(":
        break
    L.append(t)
for t in T[::-1]:
    if t==")":
        break
    R.append(t)
ans_lst=L+["@"]+R[::-1]
print(*ans_lst,sep="")