#include <bits/stdc++.h>
using namespace std;
template <typename T>
T ii() {
  T a;
  cin >> a;
  return a;
}
struct custom_hash {
  static uint64_t splitmix64(uint64_t x) {
    x += 0x9e3779b97f4a7c15;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    return x ^ (x >> 31);
  }
  size_t operator()(uint64_t x) const {
    static const uint64_t FIXED_RANDOM =
        chrono::steady_clock::now().time_since_epoch().count();
    return splitmix64(x + FIXED_RANDOM);
  }
};
int main(void) {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  int n, m;
  cin >> n >> m;
  string s, t;
  cin >> s >> t;
  vector<int> ans(m + 1);
  for (int i = (0); i <= (m - n); i++) {
    vector<int> cur;
    for (int j = (0); j <= (n - 1); j++)
      if (s[j] != t[i + j]) cur.push_back(j + 1);
    if (cur.size() < ans.size()) ans = cur;
  }
  cout << (ans.size()) << endl;
  for (auto var : ans) cout << var << " ";
  cout << endl;
  return 0;
}
