#include<bits/stdc++.h>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

char s1[2000010],s2[2000010];

int prefix[2000010],n,m,k;

int ans[2000010];

int main()
{
    fin>>s1;
    fin>>s2;
    n=strlen(s1);
    m=strlen(s2);
    int j=0;
    for(int i=1; i<=n-1; i++)
    {
        while(j>0&&s1[i]!=s1[j])
            j=prefix[j-1];
        if(s1[i]==s1[j])
            j++;
        prefix[i]=j;
    }
    j=0;
    for(int i=0; i<m; i++)
    {
        while(s2[i]!=s1[j]&&j>0)
            j=prefix[j-1];
        if(s2[i]==s1[j])
        {
            j++;
            if(j==n)
                ans[++k]=i-n+1;
        }
    }
    fout<<k<<'\n';
    for(int i=1; i<=min(k,1000); i++)
        fout<<ans[i]<<" ";
    return 0;
}