#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <cstring>
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>
#include <queue>
#include <stack>
#include <deque>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>

using namespace std;
#define INF 1234567890
bool arr[2000010];

int main() {
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);

	int a,b;
	cin >> a >>b;
	
	int j;
	arr[1] = true;
	for (int i = 2; i < sqrt(2000010); i++) {
		if (arr[i] == true) continue;
		for (int j = i + i; j <= 2000010; j+=i) {
			arr[j] = true;
		}
	}
	for (int i = a; i <= b; i++) {
		if (!arr[i]) cout << i << "\n";
	}

	return 0;
}