#include <bits/stdc++.h>

using namespace std;

ifstream si("strmatch.in");
ofstream so("strmatch.out");

string s,s2;
int n,b=101,m1=100007,m2=100021,rs,h1,h2,m,i,hash1,hash2,p1,p2,v[1001];

int main()
{
    si>>s>>s2;
    n=s.length();
    m=s2.length();
    p1=1;
    p2=1;
    for(i=0; i<n; i++)
    {
        hash1=hash1*b%m1+s[i];
        hash2=hash2*b%m2+s[i];
        if(i!=0)
        {
            p1=p1*b%m1;
            p2=p2*b%m2;
        }
    }
    if(n>m)
    {
        so<<0<<'\n';
        return 0;
    }
    for(i=0; i<n; i++)
    {
        h1=h1*b%m1+s2[i];
        h2=h2*b%m2+s2[i];
    }
    if(h1==hash1 && h2==hash2)
    {
        rs++;
        v[rs]=0;
    }
    for(i=n; i<m; i++)
    {
        h1=((h1-s2[i-n]*p1%m1+m1)*b+s2[i])%m1;
        h2=((h2-s2[i-n]*p2%m2+m2)*b+s2[i])%m2;
        if(h1==hash1 && h2==hash2)
        {
            rs++;
            if(rs<=1000)
            {
                v[rs]=i-n+1;
            }
        }
    }
    so<<rs<<'\n';
    if(1000<rs) rs=1000;
    for(i=1; i<=rs; i++)
    {
        so<<v[i]<<" ";
    }

    return 0;
}