#include <iostream>
#include <fstream>
#include <cstring>
#include <vector>


using namespace std;
ifstream f("strmatch.in" );
ofstream g("strmatch.out");

char A[2000004], B[2000004];

int state[2000004];
int suffixe[2000004];

void InitializareAutomat(char A[])
{
    int m = strlen(A+1);
    suffixe[1] = 0;
    int i = 0;

    for ( int j=2; j<=m; j++ )
    {
        while ( i>0 && A[i+1] != A[j] )
            i = suffixe[i];
        if ( A[i+1] == A[j] ) i++;
        suffixe[j] = i;
    }
}

void KMP(char A[], char B[])
{
    int m = strlen(A+1);
    int n = strlen(B+1);


    for ( int i=1; i<=n; i++ )
        if ( B[i] == A[state[i-1]+1] )
            state[i] = state[i-1]+1;
        else
        {
            int k = suffixe[state[i-1]];
            while ( k>0 && B[i] != A[k+1] ) k = suffixe[k];
            state[i] = k+1;
        }
}


int main()
{
    f.getline(A+1, 2000004);
    f.getline(B+1, 2000004);

    int m = strlen(A+1);
    int n = strlen(B+1);

    InitializareAutomat(A);
    KMP(A, B);


    vector<int> output;
    for ( int i=1; i<=n; i++ )
        if ( state[i] == m )
            output.push_back(i-m);

    g << output.size() << '\n';
    for ( int i=0; i<min(unsigned(1000), output.size()); i++ )
        g << output[i] << ' ';
}