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

bool check(int n){
	int dn=0;
	int n1=n;
	while (n1 != 0){
		++dn;
		n1 /= 10;
	}
	int res=(dn+1)/2;
	while (n != 0){
		if (n%10 == n/(int)(pow(10, dn-1))){
			n%=(int)(pow(10, dn-1));
			n/=10;
			dn-=2;
		}
		else{
			return false;
		}
	}
	return true;
}

signed main(){
	int a, n;
	cin >> a >> n;

	vector<bool> v(n+1, true);
	v[0] = false;
	v[1] = false;

	for (int i=2; i<=n; ++i){
		if (v[i]){
			for (int j=i*i; j<=n; j+=i){
				v[j] = false;
			}
		}
	}
	int c = 0;
	for (int i=a; i<=n; ++i){
		if (v[i]) {
			if (check(i)){
				cout << i << " ";
				++c;
			}
		}
	}
	if (!c) cout << c;
	return 0;
}