#include <fstream>
#include <cstring>
#define dim 2000001
using namespace std;

ifstream fin("strmatch.in");
ofstream fout("strmatch.out");

int n,m,p[dim],i,j,l,cnt,sol[1010];
char a[dim],b[dim];

int main(){
    fin>>a+1>>b+1;
    n=strlen(a+1);
    m=strlen(b+1);

    l=0;
    for(i=2;i<=n;i++){
        while(l && a[l+1]!=a[i])
            l=p[l];

        if(a[l+1]==a[i])
            l++;

        p[i]=l;
    }

    l=0;
    for(i=2;i<=m;i++){
        while(l && a[l+1]!=b[i])
            l=p[l];

        if(a[l+1]==b[i])
            l++;

        if(l==n){
            if(++cnt<=1000)
                sol[cnt]=i-n;
            l=p[l];
        }
    }

    fout<<cnt<<"\n";
    for(i=1;i<=min(cnt,1000);i++)
        fout<<sol[i]<<" ";

    return 0;
}