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

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

const int NMAX=2e6;
string A, B;
int ps[NMAX], k, cnt, q[NMAX+1], vf;

void citire() {
	getline(fin, A);
	A.push_back('#');
	k=A.size();
	getline(fin, B);
	A+=B;
}

void build_ps(string s) {
	int m=(int)s.size();
	ps[0]=0;
	int i=1, cur=0;
	while(i<m) {
		if(s[i]==s[cur]) {
			++cur;
			ps[i]=cur;
			if(ps[i]==k-1) {
				++cnt;
				if(cnt<=1000)
					q[++vf]=i-2*k+2;
			}
			++i;
			continue;
		} 
		if(cur==0) {
			ps[i]=0;
			++i;
			continue;
		}
		cur=ps[cur-1];
	}
}

int main() {
	citire();
	build_ps(A);
	fout<<cnt<<'\n';
	for(int i=1;i<=vf;++i) {
		fout<<q[i]<<' ';
	}
	fout<<'\n';
	return 0;
}