#include <bits/stdc++.h>
using namespace std;
long long a[10000000];
int main() {
  long long n, i, j, m, l, r, cnt = 0;
  string s, s2, s3 = "", s4 = "", s5 = "";
  cin >> s >> s2;
  n = s.size();
  for (i = 0; i < n - 1; i++) {
    if (s[i] == s2[i])
      s3 += s[i];
    else
      break;
  }
  for (i = n - 1; i > 0; i--) {
    if (s[i] == s2[i - 1])
      s4 += s[i];
    else
      break;
  }
  l = s3.size();
  r = s4.size();
  if (l + 1 < n - r)
    cout << "0" << endl;
  else {
    s5 = s5 + s[l];
    cnt = 0;
    for (i = l; i >= 0; i--) {
      if (s5[0] == s[i]) {
        a[cnt] = i + 1;
        ++cnt;
      } else
        break;
    }
    for (i = l + 1; i < n; i++) {
      if (s5[0] == s[i]) {
        a[cnt] = i + 1;
        ++cnt;
      } else
        break;
    }
    sort(a, a + cnt);
    cout << cnt << endl;
    for (i = 0; i < cnt; i++) {
      cout << a[i] << " ";
    }
  }
}
