#include <iostream>
#include <vector>
#include <string>
#include <bitset>

using namespace std;

const unsigned long long base = 197;
const int MAX = 2e6 + 14;

void hsh(string a, unsigned long long &hash_a) {
  unsigned long long p = 1;
  for (auto x : a) {
    hash_a += (x - '0') * 1ull * p;
    p *= base;
  }
}

bitset < MAX > found_at;

int main() {
  freopen("strmatch.in", "r", stdin);
  freopen("strmatch.out", "w", stdout);

  string a, b;
  cin >> a >> b;
  
  unsigned long long hash_a = 0;
  hsh(a, hash_a);

  vector < unsigned long long > h(b.size() + 14);
  vector < unsigned long long > base_pow(b.size() + 14);

  base_pow[0] = 1;
  for (int i  = 1; i <= b.size(); i ++) {
    base_pow[i] = base_pow[i - 1] * base;
  }

  for (int i = b.size() - 1; i >= 0; i --) {
    h[i] = h[i + 1] * base + (b[i] - '0') * 1ull;
  }

  int cnt = 0;

  for (int i = 0; i <= b.size() - a.size(); i ++) {
    if (hash_a == (h[i] - (h[i + a.size()] * base_pow[a.size()]))) {
      cnt ++;
      found_at[i] = true;
    }
  }

  cout << cnt << '\n';
  for (int i = 0; i <= b.size(); i ++) {
    if (found_at[i]) {
      cout << i << ' ';
    }
  }
}