#include <iostream>
#include <stdio.h>
#include <string>
#include <vector>
#include <algorithm>
#include <string.h>

#define MAXN 2000001
#define MOD 100007
#define D   'z'
using namespace std;
int prefix[MAXN]; 
vector<int> match; 

void computePrefix(string A) {
    int m = A.length(); 
    int k = -1; 
    prefix[0] = -1; 
    for (int i = 1; i < m; i++) {
        while (k > 0 && A[k + 1] != A[i]) {
            k = prefix[k]; 
        }
        if (A[k + 1] == A[i]) {
            k = k + 1;
        }
        prefix[i] = k; 
    }
}

void kmp(string A, string B) {
    computePrefix(A); 
    int m = A.length(); 
    int n = B.length(); 
    int k = -1; 
    for (int i = 0; i < n; i++) {
        // try to match 
        if (A[k + 1] == B[i]) {
            k ++; 
        } else {
            while ( k >= 0 && A[k + 1] != B[i]) {
                k = prefix[k]; 
            }
        }
        if (k == m - 1) {
            match.push_back(i - m + 1); 
            k = prefix[k]; 
        }
    }
}

void print() {
     printf("%d\n",match.size());
    int nrRes = min((int) match.size(), 1000);
    for (int i = 0; i < nrRes; i++) {
        printf("%d ", match[i]);
    }
}


int main() {
    freopen("strmatch.in", "r", stdin);
    freopen("strmatch.out", "w", stdout);
    string A, B;
    cin >> A >> B;
    kmp(A, B);
    print(); 
    fclose(stdin);
    fclose(stdout);
}