#include <bits/stdc++.h>
#define L 4000005
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

string a, b, s;
int pi[L];

void KMP(){
  s = a + "#" + b;
  pi[0] = 0;
  int k = 0;
  for (int i = 1; i < (int)s.size(); i++){
    while (k > 0 && s[k] != s[i])
      k = pi[k - 1];
    if (s[k] == s[i])
      k++;
    pi[i] = k;
  }
}

int main(){
  fin >> a >> b;
  KMP();
  int r = 0;
  for (int i = a.size() + 1; i < (int)s.size(); i++)
    r += (pi[i] == (int)a.size());
  fout << r << "\n";
  for (int i = a.size() + 1; i < (int)s.size(); i++)
    if (pi[i] == (int)a.size())
      fout << i - 2 * a.size() << " ";
  fout << "\n";
  return 0;
}