#include <bits/stdc++.h>
#define NN 2000005
using namespace std;
ifstream fin ("strmatch.in");
ofstream fout ("strmatch.out");

char a[NN], b[NN];
int va[NN];
int pa;
int na, nb;
queue <int> q;

int main()
{
    fin >> a >> b;
    na = strlen(a);
    nb = strlen(b);
    pa = -1;
    va[0] = -1;
    for(int i = 1 ; i < na ; i++)
    {
        if(a[pa + 1] == a[i])
            pa++;
        else
            pa = -1;
        va[i] = pa;
    }
    pa = -1;
    for(int i = 0 ; i < nb ; i++)
    {
        if(b[i] == a[pa + 1])
        {
            if(pa + 1 == na - 1)
            {
                q.push(i - na + 1);
                pa = va[pa + 1] - 1;
                i--;
                continue;
            }
            pa++;
        }
        else
            pa = -1;

    }
    fout << q.size() << '\n';
    while(!q.empty())
    {
        fout << q.front() << " ";
        q.pop();
    }
    return 0;
}