mod = 998244353


def main():
    import sys
    input = sys.stdin.readline

    S = input().rstrip('\n')
    T = []
    flg = 0
    for s in S:
        if s == "(":
            flg = 1
            T.append("@")
        elif s == ")":
            flg = 0
        else:
            if not flg:
                T.append(s)
    print("".join(T))


if __name__ == '__main__':
    main()