#include<stdio.h>
#include<string.h>
#include<vector>
using namespace std;
vector<int> sol;
char s1[2000005],s2[2000005];
int p[2000005];
int main()
{
    freopen("strmatch.in","r",stdin);
    freopen("strmatch.out","w",stdout);
    int n,m,i;
    gets(s1+1);gets(s2+1);
    n=strlen(s1+1);m=strlen(s2+1);
    int k;
    /* prefixe: */
    k=0;p[1]=0;
    for(i=2;i<=n;i++)
    {
        while(k>0 && s1[k+1]!=s1[i])
            k=p[k];
        if(s1[k+1]==s1[i]) k++;
        p[i]=k;
    }
    /* KMP: */
    k=0;
    for(i=1;i<=m;i++)
    {
        while(k>0 && s1[k+1]!=s2[i])
            k=p[k];
        if(s1[k+1]==s2[i])
            k++;
        if(k==n)
            sol.push_back(i-1);
    }
    printf("%d\n",(int)sol.size());
    for(i=0;i<min((int)sol.size(),1000);i++)
        printf("%d ",sol[i]-n+1);
    return 0;
}