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

string bracket_order(string bracket) {
    stack <int> steck;

    for (int i = 0; i < bracket.length(); i++) {

        if (bracket[i] == '(' || bracket[i] == '[')
            steck.push(bracket[i]);
        else if (bracket[i] == ')' && steck.top() == '(')
            steck.pop();
        else if (bracket[i] == ']' && steck.top() == '[')
            steck.pop();
        else
            return "NO";
    }

    if (steck.empty())
        return "YES";
    else
        return "NO";

}

int main() {
    ifstream fin("brackets.in");
    ofstream fout("brackets.out");
    string bracket;

    while (fin >> bracket) {
        fout << bracket_order(bracket);
    }

    fin.close();
    fout.close();
    return 0;
}