#include <iostream>
#include <sstream>
#include <vector>
 
using namespace std;
 
int main() {
	int pt_count, search_value;
	cin >> pt_count;
 
	string data_text;
	cin >> ws;
	getline(cin, data_text);
 
    cin >> search_value;
 
    int day_no = 0;
    vector<int> result;
 
    stringstream istr(data_text);
    int value;
 
    while(day_no++ < pt_count) {
    	istr >> value;
    	if (value == search_value) {
    		result.push_back(day_no);
    	}
    }
 
    cout << result.size() << " ";
    for (int i=0; i < result.size(); i++) {
        cout << result[i] << " ";
    }
    cout << endl;
 
	return 0;
}

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NQotMiAwIDEgLTIgMwotMg==

5
-2 0 1 -2 3
-2