bool checkNgoac(string temp) {
	int count1 = 0, count2 = 0, count3 = 0; 
	//count1 - count {
	//count2 - count [
	//count3 - count (
	for (int i = 0;i < temp.length();i++) {
		if (temp[i] == 40) {
			count1++;
		}
		else if (temp[i] == 91) {
			count2++;
		}
		else if (temp[i] == 123){
			count3++;
		}
		else if (temp[i] == 41) {
			count1--;
		}
		else if (temp[i] == 93) {
			count2--;
		}
		else if (temp[i] == 125) {
			count3--;
		}
	}
	if (count1 != 0 || count2 != 0 || count3 != 0) {
		return false;
	}
	return true;
}