{"trustable":false,"sections":[{"title":"","value":{"format":"PLAIN","content":"咕咕是一只神奇的咕咕,虽然他很讨厌字符串但是他喜欢看别人做字符串的题目,现在咕咕给了你一个只含有\u0027(’ 和‘)’和\u0027[\u0027和\u0027]\u0027的字符串,现在让你把他变成正则序列。\n正则序列:\n1. 空序列是正则序列\n2. 如果S是正则序列,那么(S)和[S]也是\n3. 如果A是B也是,那么AB也是正则序列\n"}},{"title":"Input","value":{"format":"PLAIN","content":"输入一个只含有\u0027(\u0027, \u0027)\u0027, \u0027[\u0027, \u0027]\u0027字符的字符串,字符串的最大长度是100(也可能是空串哦,听说有玄学,建议使用gets读入)\n"}},{"title":"Output","value":{"format":"PLAIN","content":"输出最少需要多少次变换后的序列(需要换行)\n"}},{"title":"Sample Input","value":{"format":"PLAIN","content":"([(]\n"}},{"title":"Sample Output","value":{"format":"PLAIN","content":"()[()]\n"}}]}