#include<stdio.h>
#include<iostream>
#include<stack>
#include<string>
using namespace std;

int main(){
    stack<char> stk;
    string str;
    cin>>str;
    int len = str.length();
    for(int i = 0; i<len; i++){
        if(!stk.empty()&&(str[i] == ')' && stk.top() == '(') || (str[i] == ']' && stk.top() == '[')){
            stk.pop();
        }else{
            stk.push(str[i]);
        }
    }
    if(stk.empty()){
        cout<<"YES"<<endl;
    }else{
        cout<<"NO"<<endl;
    }
}