#include <fstream>
#include <stack>

using namespace std;

string cbs(string&);

int main(){
    ifstream fin("stackin.txt");
    ofstream fout("stackout.txt");
    string buffer;

    while(getline(fin, buffer)) {
        fout << cbs(buffer) << endl;
    }
    fin.close();
    fout.close();
    return 0;
}



string cbs(string &buffer)
{
    stack<char> brackets;
    for(int i = 0; i < buffer.length(); i++)
    {
        if(buffer[0] == ')' || buffer[0] == ']')
        {
            return "NO";
        }
        else if(buffer[i] == '[' || buffer[i] == '(')
        {
            brackets.push(buffer[i]);
        }
        else if( (buffer[i] == ']' && brackets.top() != '[') || (buffer[i] == ')' && brackets.top() != '('))
        {
            return "NO";
        }
        else
        {
            brackets.pop();
        }
    }
    if(brackets.empty())
        return "YES";
    else
        return "NO";
}