#include <iostream>
#include <fstream>
#include <stdint.h>
#include <string.h>

const int32_t MAX_LEN = 2000000;

char str1[MAX_LEN + 1], str2[MAX_LEN + 1];
int32_t table[MAX_LEN];
int32_t res[MAX_LEN], top = 0;

int main() {
    std::ifstream fin("strmatch.in");
    std::ofstream fout("strmatch.out");

    fin >> str1 >> str2;

    int32_t len1 = strlen(str1), len2 = strlen(str2);

    table[0] = -1;
    int32_t pos = -1;
    for(int32_t i = 1; i != len1; ++i) {
        while(pos >= 0 && str1[pos + 1] != str1[i])
            pos = table[pos];
        if(str1[pos + 1] == str1[i])
            ++pos;
        table[i] = pos;
    }

    pos = 0;
    for(int32_t i = 0; i != len2; ++i) {
        while(pos >= 0 && str1[pos + 1] != str2[i])
            pos = table[pos];
        if(str1[pos + 1] == str2[i])
            ++pos;
        if(pos == len1 - 1)
            res[top++] = i - len1 + 1;
    }

    fout << top << '\n';
    for(int32_t i = 0; i != top; ++i)
        fout << res[i] << ' ';

    fin.close();
    fout.close();

    return 0;
}