import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
rec = False #再帰を使うときはこれをTrueにする
if rec:
    sys.setrecursionlimit(5 * 10 ** 5)
    from pypyjit import set_param
    set_param('max_unroll_recursion=-1')
inf = 2 ** 63 - 1
mod = 998244353

flag = False

t = input()

ans = []

for v in t:
    if v == '(':
        flag = True
    
    if not flag:
        ans.append(v)
    if v == ')':
        flag = False
        ans.append('@')
print(''.join(ans))