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