#include <fstream>
#include <cstring>
using namespace std;

ifstream f("strmatch.in");
ofstream g("strmatch.out");

long n,m,i,j,pr[2000005],nr,v[2000005];
char A[2000005],B[2000005];

void prefix()
{
    long k=-1;
    for (int i=1;i<n;i++)
    {
        while (k>0 && A[k+1]!=A[i])
            k=pr[k];
        if (A[k+1]==A[i])
            k++;
        pr[i]=k;
    }

}
int main()
{
    f>>A>>B;
    n=strlen(A);
    m=strlen(B);

    prefix();

    long k=-1;
    pr[0]=-1;
    for (i=0;i<m;i++)
    {
        if (A[k+1]!=B[i])
        {
            while (k>=0 && A[k+1] !=B[i])
                k=pr[k];
        }
        else if (A[k+1]==B[i])
            k++;
        if (k==n-1)
        {
            nr++;
            v[nr]=i-n+1;
        }
    }

    g<<nr<<'\n';
    for (i=1;i<=nr;i++)
        g<<v[i]<<' ';
    return 0;
}