//Code by Patcas Csaba aka SleepyOverlord
#include <vector>
#include <array>
#include <string> 
#include <set> 
#include <map> 
#include <unordered_set>
#include <unordered_map>
#include <queue> 
#include <bitset> 
#include <stack>
#include <list>

#include <numeric> 
#include <algorithm> 
#include <random>
#include <chrono>

#include <cstdio>
#include <fstream>
#include <iostream> 
#include <sstream> 
#include <iomanip>
#include <climits>

#include <cctype>
#include <cmath> 
#include <ctime>
#include <cassert>

using namespace std;

#define ULL unsigned long long
#define LL long long
#define PII pair <int, int>
#define PLL pair <LL, LL>
#define VB vector <bool>
#define VI vector <int>
#define VLL vector <LL>
#define VD vector <double>
#define VS vector <string>
#define VPII vector <pair <int, int> >
#define VVI vector < VI >
#define VVLL vector < VLL >
#define VVB vector < VB >
#define SI set < int >
#define USI unordered_set <int>
#define MII map <int, int>
#define UMII unordered_map <int, int>

#define FORN(i, n) for(int i = 0; i < (n); ++i)
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define MX(x, y) x = max(x, y)
#define MN(x, y) x = min(x, y)

#define SZ size()
#define BG begin() 
#define EN end() 
#define CL clear()
#define X first
#define Y second
#define RS resize
#define PB push_back
#define MP make_pair
#define ALL(x) x.begin(), x.end()
#define ALL1(x) x.begin() + 1, x.end()
#define INS insert
#define ER erase
#define CNT count

template <class T> ostream& operator <<(ostream & os, const vector<T> &vec)
{
	for (int i = 0; i < vec.size() - 1; ++i) os << vec[i] << ' ';
	return os << vec[vec.size() - 1];
}

template <class T1, class T2> ostream& operator <<(ostream & os, const pair<T1, T2> &p)
{
	return os << p.X << " " << p.Y;
}

template <typename T>
void pr(T var1)
{
	cout << var1 << '\n';
}
template <typename T, typename... Types>
void pr(T var1, Types... var2)
{
	cout << var1;
	pr(var2...);
}

int m, cnt;
string text, pattern;
VI sol, prefix;

void build()
{
	prefix.RS(pattern.SZ);
	int j = -1;
	prefix[0] = j;
	FOR(i, 1, pattern.SZ - 1)
	{
		while (j >= 0 and pattern[j + 1] != pattern[i]) j = prefix[j];
		if (pattern[j + 1] == pattern[i]) ++j;
		prefix[i] = j;
		if (j == m - 1) 
		{
			++cnt;
			if (sol.SZ < 1000) sol.PB(i - 2 * m);
		}
	}
}

int main()
{
	#ifdef AT_HOME
	freopen("a.in", "r", stdin);
	freopen("a.out", "w", stdout);
	#else
	freopen("strmatch.in", "r", stdin);
	freopen("strmatch.out", "w", stdout);
	#endif

	cin >> pattern >> text;
	m = pattern.SZ;
	pattern += "#" + text;
	build();
	pr(cnt);
	for (int x : sol) cout << x << " ";

	return 0;
}