#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;

ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

const int maxn=2000004;
char sirA[maxn],sirB[maxn];
int M,N,pi[maxn],pos[1026];

void prefix(){
  M=strlen(sirA);
  int i,q=0;
  for(i=2,pi[1]=0;i<=M;++i){
    while(q&&sirA[q+1]!=sirA[i])
      q=pi[q];
    if(sirA[q+1]==sirA[i])
      ++q;
      pi[i]=q;
  }
}
int main(){
  fin.getline(sirA,maxn);
  fin.getline(sirB,maxn);
  N=strlen(sirB);
  int q=0,n=0,i;
  prefix();
  for(i=1;i<=N;++i){
    while(q&&sirA[q+1]!=sirB[i])
      q=pi[q];
    if(sirA[q+1]==sirB[i])
      ++q;
    if(q==M){
      q=pi[M];
      ++n;
      if(n<=1000)
        pos[n]=i-M;
    }
  }
  fout<<n<<'\n';
  for(i=1;i<=min(n,1000);++i)
    fout<<pos[i]<<' ';
  return 0;
}