#include <bits/stdc++.h>
#define MOD  1000000007
#define baza 128
using namespace std;
ifstream f("strmatch.in");
ofstream g("strmatch.out");
char a[2000005],b[2000005];
long long  n,n1,i,sum,sum1,nr,v[2000005];
long long  val (char x)
{
    return int(x);
}
long long  ridput (long long  a,long long  b)
{
    if (b==0)
    {
        return 1LL;
    }
    long long  rez=ridput(a,b/2);
    if (b%2==0)
    {
        return (rez*rez)%MOD;
    }
    return ((rez*rez)%MOD*a)%MOD;
}
int main()
{
    f.getline (a,2000005);
    f.getline (b,2000005);
    n=strlen(a);
    n1=strlen(b);
    for (i=0;i<n;i++)
    {
        sum=(sum+(1LL*ridput(baza,i)*val(a[i]))%MOD)%MOD;
    }
    for (i=0;i<n&&i<n1;i++)
    {
        sum1=(sum1+(1LL*ridput(baza,i)*val(b[i]))%MOD)%MOD;
    }
    if (sum1==sum)
    {
        nr++;
        v[nr]=0;
    }
    for (i=n;i<n1;i++)
    {
        sum1=(((sum1-val(b[i-n])+MOD))%MOD*ridput(baza,MOD-2))%MOD;
        sum1=(sum1+(1LL*ridput(baza,n-1)*val(b[i]))%MOD)%MOD;
        if (sum1==sum)
        {
            nr++;
            v[nr]=i-n+1;
        }
        if (nr==1000)break;
    }
    g<<nr<<'\n';
    for (i=1;i<=nr;i++)
    {
        g<<v[i]<<" ";
    }
    return 0;
}