#include <fstream>
#include <iostream>
#include <string>
using namespace std;

class stek {
private:
	int sizep;
	int size;
	char *p; //simbols

public:

	stek() {
		size = 0;
		sizep = 0;
	}

	void push_back(char a) {
		size++;

		if (size >= sizep) {
			sizep = (sizep + 1) * 2;
			char *newarray = new char[sizep]; //create mew massive with increased size
			for (int i = 0; i < size - 1; i++) {
				newarray[i] = p[i];
			}
			newarray[size - 1] = a;
			delete[] p;
			p = newarray;
		}
		else {
			p[size - 1] = a;
		}
	}

	void pop_back(char c, int *o) { //simbol of ([]), *o right or wrong
		if (size - 1 >= 0 &&  (p[size - 1] == '(' and c == ')' or p[size - 1] == '[' and c == ']'))
		{
			size--; //delete element
		}
		else  *o = 0;

	}

	void del()
	{
		delete[] p; //delete massive
		p = nullptr; // присвоили указателю на массив "ничего"
		size = 0; // аналогично
		sizep = 0;
	}

	~stek() {
		delete[] p;
	}

};

int main() {
	//ifstream СЃin("stack.in");
	stek a;
	string s;
	//ofstream СЃout("stack.out");

	while (cin >> s)
	{
		int o = 1;
		for (int i = 0; i < s.size(); i++)
		{
			if ('[' == s[i] or '(' == s[i])
			{
				a.push_back(s[i]);
			}
			if (')' == s[i] or ']' == s[i])
			{
				a.pop_back(s[i], &o);
				if (o == 0)
				{
					cout << "NO";
					break;

				}
			}
		}
		if (o == 1)
		{
			cout << "YES";
		}
		a.del(); //делаем это для занесения другой строки. очистка памяти
	}

	return 0;
}