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

using namespace std;

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

vector <int> matches;

const int BASE = 131;
const int MOD = 1e9 + 7;

int main() {
    
    unsigned long i;
    string A, B;
    
    fin >> A >> B;
    
    int BASE_POW = 1;
    for ( i = 0; i < A.size(); i++ )
        BASE_POW = (long long) BASE_POW * BASE % MOD;
    
    int ha = 0;
    for (int i = 0; i < A.size(); i++)
        ha = ( (long long) ha * BASE + A[i] ) % MOD;
    
    int h1 = 0, h2 = 0;
    for ( i = 0; i < A.size() - 1; i++)
        h1 = ( (long long) h1 * BASE + B[i] ) % MOD;
    
    int hi = 0;
    
    for ( i = A.size() - 1; i < B.size(); i++ ) {
        
        h1 = ( (long long) h1 * BASE + B[i] ) % MOD;
        
        hi = ( h1 - (long long) h2 * BASE_POW % MOD + MOD ) % MOD;
        
        h2 = ( (long long) h2 * BASE + B[i - A.size() + 1]) % MOD;
        
        if ( hi == ha )
            matches.push_back ( i - A.size() + 1 );
        
    }
    
    fout << matches.size () << "\n";
    
    for ( i = 0; i < matches.size() && i < 1000; i++ )
        fout << matches[i] << " ";
    
}