//file name:zhishu.java  //输出区间的所有质数
import java.util.*;
public class zhishu
{   
    public static void main(String[] args)    {
        Scanner in = new Scanner(System.in);
        System.out.println("输入数的上限跟下限：");
        int min = in.nextInt();
        int max = in.nextInt();
        boolean f = true;
        if(min%2==0)   
        {
            for(int i=min+1;i<max;i+=2)    {
                for(int j=2;j<i;j++){
                    if(i%j == 0){
                        f = false;
                        break;
                    }
            
                }
                if(!f){
                        f = true;
                        continue;                        
                }
                System.out.println(i);
            }
        }
        else   
        {
            for(int i=min;i<max;i+=2)    {
                for(int j=2;j<i;j++)    {
                    if(i%j == 0)    {
                        f = false;
                        break;
                    }
                }
                    if(!f)    {
                        f = true;
                        continue;
                    }
                System.out.println(i);
            }
        }   
    }
}