#include<bits/stdc++.h>

using namespace std;

int main() {
    //打开文件,改一下文件名
    freopen("prime.txt", "w", stdout);
    //x和y分别是要打表的素数开始值和结束值
    int a, b;
    int x, y, num = 0;;
    cin >> x >> y;
    for (a = x; a <= y; a++) {
        for (b = 2; b <= sqrt(a); b++) {
            if (a % b == 0) break;
        }
        if (b > sqrt(a)) {
            cout << a << ",";
            num++;
        }
    }
    cout << endl << num;
    return 0;
}