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

#define nMax 2000001
#define solMax 1001

using namespace std;

ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

int n, m, Sol;
int vect[solMax], pref[nMax];

char A[nMax], B[nMax];

void make_prefix(char A[], int len)
{
    int q=0;
    pref[1]=0;

    for(int i=2; i<=len; i++)
    {
        while(q!=0 && A[q+1]!=A[i])
            q=pref[q];
        if(A[q+1]==A[i])
            q++;
        pref[i]=q;
    }
}

void match(char A[], char B[], int lenF, int lenS)
{
    int q=0;

    for(int i=1; i<=lenS; i++)
    {
        while(q!=0 && A[q+1]!=B[i])
            q=pref[q];
        if(A[q+1]==B[i])
            q++;

        if(q==lenF)
        {
            q=pref[q];
            Sol++;

            if(Sol<solMax)
                vect[Sol]=i-lenF;
        }
    }
}

void write()
{
    fout<<Sol<<'\n';

    for(int i=1; i<=min(Sol, 1000); i++)
        fout<<vect[i]<<" ";
}

int main()
{
    fin>>A+1>>B+1;
    n=strlen(A+1);
    m=strlen(B+1);

    make_prefix(A, n);
    match(A, B, n, m);

    write();
}