#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <stack>
#include <string.h>
using namespace std;
int main(){
	char s[1000];
	cin >> s;
	int len =strlen(s);
	stack<char> st;
	for(int i = 0;i <len;i++){
		if(!st.empty()){
			char now = st.top();
			if((s[i] == ')'&&now == '(') || (s[i] == ']'&&now =='['))
			    st.pop();
			else
			    st.push(s[i]);
		}
		else
		   st.push(s[i]);
	}
	if(st.empty())
	   cout << "YES"<<endl;
	else
	   cout <<"NO"<<endl;
	return 0;
}