#include <fstream>
#include <cstring>
#define dim 2000010
using namespace std;
char a[dim];
char b[dim];
int pat[dim];
int sol[1010];
int i,j,n,m,nr;

int main() {
    ifstream fin("strmatch.in");
    ofstream fout("strmatch.out");
    fin>>a+1;
    fin>>b+1;
    m=strlen(a+1);
    n=strlen(b+1);
    for (i=2;i<=m;i++) {
        if (a[i]==a[pat[i-1]+1]) {
            pat[i]=pat[i-1]+1;
        }
    }
    for (i=1;i<=n;i++) {
        if (a[j+1]==b[i]) {
            j++;
        }
        else {
            j=pat[j];
        }
        if (j==m) {
            sol[++nr]=i-m;
            j=pat[j];
        }
    }
    fout<<nr<<"\n";
    for (i=1;i<=min(nr,1000);i++) {
        fout<<sol[i]<<" ";
    }
   /** for (i=1;i<=n;i++) {
        fout<<pat[i]<<" ";
    } **/
    return 0;
}