#include<cstdio>
#include<vector>
#include<cstring>
using namespace std;
char S[2000001],P[2000001];
int pi[2000001],v[2000001],n,m;
void preprocesare(){
    pi[0]=0;
    int k=0;
    for(int q=1;q<m;q++){
        while((k>0)&&P[k]!=P[q])
            k=pi[k-1];
        if(P[k]==P[q])
            k++;
        pi[q]=k;
    }
}

int main(){
    freopen("strmatch.in","r",stdin);
    freopen("strmatch.out","w",stdout);
    scanf("%s\n%s",&P,&S);
    m=strlen(P);
    n=strlen(S);
    preprocesare();

    int q=0,cate=0;;
    for(int i=0;i<n;i++){
        while((q>0)&&(P[q]!=S[i])){
            q=pi[q-1];
        }
        if(P[q]==S[i]){
            q++;
        }
        if(q==m){
            if(cate<1000){
            cate++;
            v[cate]=i-m+1;
            }
        }
    }
    printf("%d\n",cate);
    for(int i=1;i<=cate;i++)
        printf("%d ",v[i]);
    return 0;
}