#include <bits/stdc++.h>
#define st first
#define nd second
#define pb push_back
#define N 4000005
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
typedef long long ll;
string s, t;
ll i, n, m, j, k, lps[N];
vector <int> ans;

int main()
{
    fin>>s>>t;
    t="."+s+"#"+t;
    n=t.size();
    lps[1]=0;
    for(i=2;i<n;i++)
    {
        j=i-1;
        while(j>0&&t[lps[j]+1]!=t[i])
            j=lps[j];
        if(j==0)
            lps[i]=0;
        else
        lps[i]=lps[j]+1;
        if(lps[i]==s.size())
        {
            k++;
            if(k<=1000)
                ans.pb(i-2*s.size()-1);
        }
    }
    fout<<k<<'\n';
    for(i=0;i<ans.size();i++)
        fout<<ans[i]<<' ';
    return 0;
}