#include <iostream>
#include <cstdio>
#include <cstring>
#include <vector>

using namespace std;

const int LMAX = 2000000;

char p[LMAX + 5], s[LMAX + 5];
int urm[LMAX + 5];

void prefix(char *pattern, int *urmp) {
  int l = strlen(pattern);

  urmp[1] = 0;
  for(int i = 2; i <= l; i++) {
    int k = urmp[i - 1];

    while(k > 0 && pattern[i - 1] != pattern[k])
      k = urmp[k];

    if(pattern[i - 1] == pattern[k])
      k++;
    urmp[i] = k;
  }
}

void findp(char *pattern, int *urmp, char *str) {
  int crt_match = 0;
  int lp = strlen(pattern), ls = strlen(str);
  vector<int> sol;

  for(int i = 1; i <= ls; i++) {
    while(crt_match > 0 && str[i - 1] != pattern[crt_match])
      crt_match = urm[crt_match];

    if(str[i - 1] == pattern[crt_match])
      crt_match++;
    if(crt_match == lp) {
      if(sol.size() < 1000)
        sol.push_back(i - lp);
      crt_match = urm[crt_match];
    }
  }

  printf("%d\n", sol.size());
  for(int match: sol)
    printf("%d ", match);
}

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

  scanf("%s%s", p, s);

  prefix(p, urm);
  findp(p, urm, s);

  return 0;
}