#include <bits/stdc++.h>
using namespace std;
ifstream in("strmatch.in");
ofstream out("strmatch.out");

char a[2000010],b[2000010];
long long p1=31,p2=101,mod1=423957231,mod2=298892145,stra,strb;

void citire()
{
    in>>a>>b;
    stra=strlen(a);
    strb=strlen(b);
}
void solv()
{
    long long hasha1=0,hasha2=0,hashb1=0,hashb2=0,c1=1,c2=1;
    vector<int>sol;
    for(int i=0;i<stra;i++)
    {
        hasha1=(hasha1*p1+a[i])%mod1;
        hasha2=(hasha2*p2+a[i])%mod2;
        hashb1=(hashb1*p1+b[i])%mod1;
        hashb2=(hashb2*p2+b[i])%mod2;
        c1=c1*p1%mod1;
        c2=c2*p2%mod2;
    }
    if(hasha1==hashb1 && hasha2==hashb2)
    {
        sol.push_back(0);
    }
    for(int i=stra;i<strb;i++)
    {
        hashb1=(mod1+hashb1*p1-(b[i-stra]*c1)%mod1+b[i])%mod1;
        hashb2=(mod2+hashb2*p2-(b[i-stra]*c2)%mod2+b[i])%mod2;
        if(hasha1==hashb1 && hasha2==hashb2)
        {
            sol.push_back(i-stra+1);
        }
    }
    out<<sol.size()<<'\n';
    int x=sol.size();
    for(int i=0;i<min(x,1000);i++)
    {
        out<<sol[i]<<' ';
    }
}
int main()
{
    citire();
    if(stra>strb)
    {
        out<<0;
        return 0;
    }
    solv();
    return 0;
}