#include <bits/stdc++.h>
using namespace std;

int main(){
    ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    freopen("strmatch.in","r",stdin);
    freopen("strmatch.out","w",stdout);
    string A,B,S;
    cin>>A>>B;
    S=A+'#'+B;
    int kmp[S.size()];
    kmp[0]=0;
    for(int i=1;i<S.size();i++){
        kmp[i]=kmp[i-1];
        while(kmp[i]>0 && S[kmp[i]]!=S[i]){
            kmp[i]=kmp[kmp[i]-1];
        }
        if(S[kmp[i]]==S[i]){
            kmp[i]++;
        }
    }
    int cnt=0;
    queue<int> q;
    for(int i=A.length()+1;i<S.length();i++){
        if(kmp[i]==A.size()){
            cnt++;
            if(q.size()<1000){
                q.push(i-(2*A.length()));
            }
        }
    }
    cout<<cnt<<'\n';
    while(!q.empty()){
        cout<<q.front()<<" ";
        q.pop();
    }
}