#include <bits/stdc++.h>

using namespace std;

ifstream f("strmatch");
ofstream g("strmatch");

string A,B;
int n, m, q;
int pi[20000005];
vector<int> res;

void Read()
{
	cin>>A>>B;
	m = A.length();
	n = B.length();
	
	A.insert(0, " ");
	B.insert(0, " ");

	f.close();
}

void compute()
{
	q = 0;
	pi[1] = 0;

	for(int i = 2;i <= m;++i)
	{
		while(q > 0 && A[q + 1] != A[i])
			q = pi[q];
		if(A[q + 1] == A[i])
			++q;
		pi[i] = q;
	}	
}

void KMP()
{
	q = 0;
	for(int i = 1;i <= n;++i)
	{
		while(q > 0 && A[q + 1] != B[i])
			q = pi[q];
		if(A[q + 1] == B[i])
			++q;
		if(q == m)
		{
			q = pi[q];
			if(res.size() < 1000)
				res.push_back(i - m);
		}
	}
}

void Print()
{
	g<<res.size()<<'\n';
	for(vector<int>::iterator it = res.begin();it != res.end();++it)
		g<<*it<<" ";
	g.close();
}

int main()
{
	Read();
	compute();
	KMP();
	Print();
	return 0;
}