#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    int len, buses;
    cin >> len >> buses;
    vector<int> v(buses);
    vector<int> occupied(len + 1, 0);
    for(int& x : v) {
        cin >> x;
        occupied[x] = -1;
    }
    int bus_length, cnt;
    cin >> cnt >> bus_length;
    int tmp = 0;
    vector<pair<int, int> > spaces;
    int sum = 0;
    int idx = -1;
    for(int i = 1; i <= len; i++) {
        if(occupied[i] == -1 and tmp > 0) {
            spaces.push_back(make_pair(tmp / bus_length, idx));
            idx = -1;
            sum += (tmp / bus_length);
            tmp = 0;
        }
        else if(occupied[i] == 0){
            if(idx == -1) {
                idx = i;
            }
            ++tmp;
        }
    }
    if(tmp > 0) {
        spaces.push_back(make_pair(tmp / bus_length, idx));
        sum += (tmp / bus_length);
    }
    sort(spaces.rbegin(), spaces.rend());
    int ret = 0;
    vector<pair<int, int> > ans;
    for(int i = 0; i < (int) spaces.size(); i++) {
        if(sum - spaces[i].first >= cnt) {
            sum -= spaces[i].first;
            ret += spaces[i].first;
            ans.push_back(make_pair(spaces[i].first, spaces[i].second));
        }
        else {
            ret += sum + 1 - cnt;
            ans.push_back(make_pair((sum + 1 - cnt), spaces[i].second));
            sum -= (sum + 1 - cnt);
            break;
        }
    }
    cout << ret << endl;
    for(int i = 0; i < (int) ans.size(); i++) {
//        cout << ans[i].first << " " << ans[i].second << endl;
        for(int j = ans[i].second + bus_length - 1, broken = 0; broken < ans[i].first; j += bus_length, broken++) {
            cout << j << " " ;
        }
    }
    return 0;
}