#include <bits/stdc++.h>
using namespace std;
char s1[2000005],s2[2000005];
int ap[2000005];
const int mod1=1e7;
const int mod2=1e9;
const int baza=97;
int main()
{
    freopen("strmatch.in","r",stdin);
    freopen("strmatch.out","w",stdout);
    fgets(s1+1,2000005,stdin);
    fgets(s2+1,2000005,stdin);
    int n=strlen(s1+1),m=strlen(s2+1);
    long long put1=1,put2=1,rez1=0,rez2=0;
    --n;--m;
    int i,j,cnt=0;
    for(i=1;i<n;i++)put1*=baza,put2*=baza,put1%=mod1,put2%=mod2;
    for(i=1;i<=n;i++)
    {
        rez1=rez1*baza+(s1[i]-'0'+1);rez1%=mod1;
        rez2=rez2*baza+(s1[i]-'0'+1);rez2%=mod2;
    }
    long long calc1=0,calc2=0;
    for(i=1;i<=m;i++)
    {
        if(i<=n)
        {
            calc1=calc1*baza+(s2[i]-'0'+1);calc1%=mod1;
            calc2=calc2*baza+(s2[i]-'0'+1);calc2%=mod2;
        }
        else
        {
            calc1-=put1*(s2[i-n]-'0'+1);calc2-=put2*(s2[i-n]-'0'+1);
            calc1%=mod1;calc2%=mod2;
            if(calc1<0)calc1+=mod1;if(calc2<0)calc2+=mod2;
            calc1=calc1*baza+(s2[i]-'0'+1);calc1%=mod1;
            calc2=calc2*baza+(s2[i]-'0'+1);calc2%=mod2;
        }
        if(calc1==rez1&&calc2==rez2&&i>=n)
            ap[++cnt]=i;
    }
        printf("%d\n",cnt);
        for(i=1;i<=min(1000,cnt);++i)printf("%d ",ap[i]-n);
    return 0;
}