#include <fstream>
#include <string.h>
#include <vector>

using namespace std;
ifstream fi("strmatch.in");
ofstream fo("strmatch.out");
const int lmax=2e6, mod1=1e5+7, mod2=1e5+21, baza=75;
char T[lmax+5], P[lmax+5];
int lgt, lgp, putere1=1, putere2=1, codp1, codp2, rhash1, rhash2, cnt;
vector <int> sol;

int cod(char c)
{
    return (c-'0');
}

int main()
{
    fi>>P>>T;
    lgp=strlen(P);
    lgt=strlen(T);

    for(int i=1; i<=lgp; i++)
    {
        putere1=(putere1*baza)%mod1;
        putere2=(putere2*baza)%mod2;
    }

    for(int i=0; i<lgp; i++)
    {
        codp1=(codp1*baza+cod(P[i]))%mod1;
        codp2=(codp2*baza+cod(P[i]))%mod2;
        rhash1=(rhash1*baza+cod(T[i]))%mod1;
        rhash2=(rhash2*baza+cod(T[i]))%mod2;
    }

    if(rhash1==codp1 && rhash2==codp2)
    {
        cnt++;
        sol.push_back(0);
    }

    for(int i=lgp; i<lgt; i++)
    {
        rhash1=(rhash1*baza-(cod(T[i-lgp])*putere1)%mod1+cod(T[i])+mod1)%mod1;
        rhash2=(rhash2*baza-(cod(T[i-lgp])*putere2)%mod2+cod(T[i])+mod2)%mod2;
        if(rhash1==codp1 && rhash2==codp2)
        {
            cnt++;
            if(cnt<=1000)
                sol.push_back(i-lgp+1);
        }
    }

    fo<<cnt<<"\n";
    for(auto p:sol)
        fo<<p<<" ";

    fi.close();
    fo.close();
    return 0;
}