#include <iostream>
#include <vector>

using namespace std;

int main() {
    int n, a;
    cin >> n >> a;
    
    vector<int> difficulties(n);
    for (int i = 0; i < n; ++i) {
        cin >> difficulties[i];
    }
    
    vector<int> solvable;
    for (int i = 0; i < n; ++i) {
        if (difficulties[i] <= a) {
            solvable.push_back(i + 1);
        }
    }
    
    if (solvable.empty()) {
        cout << "NO" << endl;
    } else {
        cout << solvable.size() << endl;
        for (int i = 0; i < solvable.size(); ++i) {
            cout << solvable[i] << " ";
        }
        cout << endl;
    }
    
    return 0;
}