#include <bits/stdc++.h>

using namespace std;

ifstream in("strmatch.in");
ofstream out("strmatch.out");
long long cod[2000000], putere[2000000];
long long X = 998757677, Y = 921314429, val = 0;
string a, b;

int main()
{
	in >> a >> b;


	for(int i = 0; i < a.size(); i++)
		val = (val * X + a[i]) % Y;
	
	cod[0] = b[0];
	putere[0] = 1;
	for(int i = 1; i < b.size(); i++)
	{
		cod[i] = (cod[i-1] * X + b[i]) % Y;
		putere[i] = (putere[i-1] * X) % Y;
	}
	
	int nrSol = 0;
	queue <int> sol;
	
	for(int i = a.size(); i < b.size(); i++)
		if((cod[i] - cod[i-a.size()] * putere[a.size()] + Y*Y) % Y == val)
		{
			nrSol++;
			sol.push(i - a.size() + 1);
		}
	
	out << nrSol << '\n';
	
	for(int i = 1; i <= min(nrSol, 1000); i++)
	{
		out << sol.front() << ' ';
		sol.pop();
	}
	
	return 0;
}