#include <iostream>
#include <fstream>
#include <cstring>
#include <vector>
using namespace std;
ifstream f("strmatch.in");
ofstream g("strmatch.out");
char x[2000002],y[2000002];
int pi[2000002];
vector<int> nr;
int main()
{
    f>>x+1;
    f>>y+1;
    int n=strlen(x+1);
    int m=strlen(y+1);
    int k=0;
    for(int i=2;i<=n;i++)
    {
        while(k&&x[i]!=x[k+1])
            k=pi[k];
        if(x[k+1]==x[i])k++;
        pi[i]=k;
    }
    k=0;
    for(int i=1;i<=m&&nr.size()<1000;i++)
    {
        while(k && y[i]!=x[k+1])
            k=pi[k];
        if(y[i]==x[k+1])
            k++;
    if(k==n&&nr.size()<1000)
    {
      nr.push_back(i-n);
    }
    }
    g<<nr.size()<<"\n";
    for(int i=0;i<nr.size();i++)
        g<<nr[i]<<" ";
    return 0;
}