A

#include <array>
#include <iostream>
#include <vector>
#include <stack>

using namespace std;

#define int long long

const long long INF = 1e18 + 7;
const int MAXN = 2e5 + 10;
const int N = 2e5;

char invert(char c) {
    if (c == ')') {
        return '(';
    }
    if (c == ']'){
        return '[';
    }
    if (c == '}') {
        return '{';
    }
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    string s;
    cin >> s;
    stack<char> st;
    for (int i = 0; i < s.size(); ++i) {
        if (s[i] == '(' || s[i] == '[' || s[i] == '{') {
            st.push(s[i]);
        } else {
            if (st.empty() || invert(s[i]) != st.top()) {
                cout << "no\n";
                return 0;
            } else {
                st.pop();
            }
        }
    }
    cout << (st.empty() ? "yes\n": "no\n");
}