#include <iostream>
#include <vector>
#include <cstdio>
using namespace std;
FILE *f=fopen("strmatch.in","r");
FILE *g=fopen("strmatch.out","w");
int T[4000005];
string a,C;
int id=1;
int nr;
vector<int> V;
int main()
{
    freopen("strmatch.in","r",stdin);
    freopen("strmatch.out","w",stdout);
    C+='$';
    cin>>a;C+=a;C+='$';T[1]=a.size();
    cin>>a;C+=a;
    for(int i=2;i<C.size();i++)
    {
        if(id+T[id]-1>=i)T[i]=min(T[i-id+1],T[1]-i+id);
        while(C[i+T[i]]==C[1+T[i]])T[i]++;
        if(T[i]==T[1])
        {
            nr++;
            if(nr<=1000)
                V.push_back(i-T[1]-2);
        }
        if(id+T[id]<i+T[i])
            id=i;
    }
    cout<<nr<<"\n";
    for(auto it:V)cout<<it<<" ";
    return 0;
}