#include <bits/stdc++.h>
#define NMAX 2000009
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
char a[NMAX],b[NMAX];
int k,lga,lgb,i,j;
int vala[NMAX],valb[NMAX];
int nrs;
vector<int>sol;

void citire();
int main()
{citire();
k=0;
for(i=2;i<=lga;i++)
    {
     while(a[k+1]!=a[i] && k)
        k=vala[k];
     if(a[k+1]==a[i])
        k++;
     vala[i]=k;
    }
 if(a[1]==b[1])
        k=1,valb[1]=1;
       else
       k=0;
  for(i=2;i<=lgb;i++)
    {
     while(a[k+1]!=b[i] && k)
        k=vala[k];
     if(a[k+1]==b[i])
         k++;
     valb[i]=k;
    if(k==lga && sol.size()<1000)
            sol.push_back(i-lga),nrs++;
            else
            if(k==lga)
            nrs++;
        }
     fout<<nrs<<'\n';
     for(i=0;i<sol.size();i++)
            fout<<sol[i]<<" ";
    return 0;
}
void citire()
{
  fin>>(a+1);
  fin>>(b+1);
  lga=strlen(a+1);
  lgb=strlen(b+1);
}