#include <iostream>
#include <fstream>
#include <vector>
#include <list>
#include <algorithm>

using namespace std;

int main() {
    ifstream in("input.txt");
    if (in) {
        vector<int> v;
        int x;
        while (in >> x) v.push_back(x);
        cout << "Введите искомое число:";
        cin >> x;
        int how_much = count(v.begin(), v.end(), x);
        cout << how_much << endl;
        list<int> pos_list;
        vector<int>::iterator pos = v.begin();
        while (1) {
            pos = find(pos, v.end(), x);
            if (pos == v.end()) break;
            pos_list.push_back((int) (pos - v.begin()));
            pos++;
        }
        list<int>::iterator i;
        for (i = pos_list.begin(); i != pos_list.end(); ++i)
            cout << *i << " ";
        return 0;
    }
    return 1;
}