#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  int n, a, b, k;
  cin >> n >> a >> b >> k;
  string s;
  cin >> s;
  s += "1";
  vector<int> ans;
  int c = 0;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] == '0')
      c++;
    else {
      for (int j = i - c - 1 + b; j < i; j += b) {
        ans.push_back(j + 1);
      }
      c = 0;
    }
  }
  cout << ans.size() - a + 1 << endl;
  for (int i = 0; i < (int)ans.size() - a + 1; i++) {
    cout << ans[i] << ' ';
  }
  return 0;
}
