#include <bits/stdc++.h>
#define MAXN 2000010
using namespace std;
 
string A,B;
int Pa[MAXN],P[MAXN];
 
int main(){
	ifstream cin("strmatch.in");
	ofstream cout("strmatch.out");
	cin>>A>>B;
    int k = 0;
    for (int i = 1; i < A.size(); i++) {
        while (A[k] != A[i] && k)
            k = Pa[k - 1];
        if (A[k] == A[i])
            k++;
        Pa[i] = k;
    }
	int j=0,i=0,l=0;
	while(i<B.size()){
		if(A[j]==B[i]){
			i++;
			j++;
		}
		if(j==A.size()){
			P[l++]=i-j;
			j=Pa[j-1];
		}else if(i<B.size() && A[j]!=B[i]){
			if(j!=0)j=Pa[j-1];
			else i++;
		}
	}
	cout<<l<<'\n';
	l=min(l,1000);
	for(int i=0;i<l;i++)cout<<P[i]<<' ';
}