#include <bits/stdc++.h>
using namespace std;

string str;

int main()
{
	cin >> str;
	
	string stk1, stk2;
	for(int i = 0; i < str.size(); i ++)
	{
		if(str[i] == '(') stk1.push_back(')');
		else if(str[i] == '[') stk1.push_back(']');
		else if(str[i] == ')') stk2.push_back('(');
		else stk2.push_back(']');
		
		if(str[i] == stk1.back()) 
		{
			stk1.pop_back();
			stk2.pop_back();
		}
	}
	
	if(stk1.empty() && stk2.empty()) cout << "YES" << endl;
	else cout << "NO" << endl;
	
    return 0;
}