#include <bits/stdc++.h>
#define lgmax 2100010
using namespace std;

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

char a[lgmax],b[lgmax];

int i,pi[lgmax],k,n,m;

vector <int> ans;

int main()
{
    fin>>a+1>>b+1;
    n=strlen(a+1);
    m=strlen(b+1);
    pi[1]=0;
    k=0;
    for(i=2;i<=n;i++)
    {
        while(k>0&&a[k+1]!=a[i])
            k=pi[k];
        if(a[k+1]==a[i])
            k++;
        pi[i]=k;
    }
    k=0;
    for(i=1;i<=m;i++)
    {
        while(k>0&&a[k+1]!=b[i])
            k=pi[k];
        if(a[k+1]==b[i])k++;
        if(k==n)
        {
            ans.push_back(i-n);
            k=pi[k];
        }
    }
    fout<<ans.size()<<'\n';
    for(i=0;i<1000&&i<ans.size();i++)fout<<ans[i]<<" ";
    return 0;
}