#include<iostream>
#include<vector>
#include<string>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    string s1, s2;
    cin >> s1 >> s2;
    char last_symbol = ' ';
    int first_index = -1;
    int last_index = -1;
    int flag = 0;
    int i = 0;
    int j = 0;

    while ((i < s1.length()) && (j < s2.length())) {
        if ((flag == 0) && (s1[i] != s2[j]) && (first_index == -1)) {
            cout << 0 << endl;
            return 0;
        }
        if ((s1[i] == s2[j]) && (flag == 0)) {
            if (s1[i] != last_symbol) {
                last_symbol = s1[i];
                first_index = i;
                last_index = i;
                i++;
                j++;
            }
            else {
                last_index = i;
                i++;
                j++;
            }
        }
        if ((s1[i] != s2[j]) && (flag == 0)) {
            flag = 1;
            if (s1[i] != last_symbol) {
                first_index = i;
                last_index = i;
            }
            else {
                last_index = i;
            }
            i++;
            continue;
        }
        if (flag == 1) {
            if (s1[i] ==  s2[j]) {
                i++;
                j++;
                continue;
            }
            else {
                cout << 0 << endl;
                return 0;
            }
        }
    }

    if (i == j) {

        cout << last_index - first_index + 2 << endl;
        for (int k = first_index; k < last_index + 2; k++){
            cout << k + 1 << " ";
        }
    }
    else {
        cout << last_index - first_index + 1 << endl;
        for (int k = first_index; k < last_index + 1; k++){
            cout << k + 1 << " ";
        }
    }



    return 0;
}