#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
char a[2000005], b[2000005];
long long i, n, m, base=127, hasha, hashb, mod=1000000007, p[2000005], hsh[2000005], nr, poz[2000005];
int main()
{
    fin>>a>>b;
    m=strlen(a);
    n=strlen(b);
    p[0]=1;
    for(i=1; i<=2000000; i++)
      p[i]=(p[i-1]*base)%mod;
    for(i=0; i<m; i++)
        hasha=(hasha*base+(a[i]-'0'))%mod;
    for(i=0; i<n; i++)
        hsh[i+1]=(hsh[i]*base+(b[i]-'0'))%mod;
    for(i=m; i<=n; i++)
    {
        long long val=(hsh[i]-(hsh[i-m]*p[m]%mod)+mod)%mod;
        if(val==hasha)
        {
            nr++;
            if(nr<=1000)
             poz[nr]=i-m;
        }
    }
    fout<<nr<<'\n';
    if(nr>1000)
        nr=1000;
    for(i=1; i<=nr; i++)
        fout<<poz[i]<<" ";

    return 0;
}