#include<stdio.h>
int main()
{
    int a,b,i,j,value;
    scanf("%d%d",&a,&b);
    for(i=a;i<=b;i++)
    {
        value=1;
        for(j=2;j<i;j++)
        {
            if(i%j==0)
            {
                value=0;
                break;
            }
        }
        if(value==1)
        {
            printf("%d\n",i);
        }
    }
    return 0;
}