#include<bits/stdc++.h>
using namespace std;
int zhishu(int a11){
	int a1=0;
	if(a11==2||a11==3){
		return 1;
	}
	else{
		for(int i1=a11-1;i1>=2;i1--){
			if(a11%i1==0){
				a1=1;
			}
		}
		if(a1==1){
			return 0;
		}else{
			return 1;
		}
	}
}
int weishu(int a,int b){//一亿以内
	int q1,q2,q3,q4,q5,q6,q7,q8;
//	q1=a%10;
//	q2=((a%100)-(a%10))/10;
//	q3=((a%1000)-(a%100))/100;
//	q4=((a%10000)-(a%1000))/1000;
//	q5=((a%100000)-(a%10000))/10000;
//	q6=((a%1000000)-(a%100000))/100000;
//	q7=((a%10000000)-(a%1000000))/1000000;
//	q8=((a%100000000)-(a%10000000))/10000000;
	switch (b) {
	case 1:
		q1=a%10;
		return q1;
		break;
	case 2:
		q2=((a%100)-(a%10))/10;
		return q2;
		break;
	case 3:
		q3=((a%1000)-(a%100))/100;
		return q3;
		break;
	case 4:
		q4=((a%10000)-(a%1000))/1000;
		return q4;
		break;
	case 5:
		q5=((a%100000)-(a%10000))/10000;
		return q5;
		break;
	case 6:
		q6=((a%1000000)-(a%100000))/100000;
		return q6;
		break;
	case 7:
		q7=((a%10000000)-(a%1000000))/1000000;
		return q7;
		break;
	case 8:
		q8=((a%100000000)-(a%10000000))/10000000;
		return q8;
		break;
	}
}
int hwzs(int ab){
	if(zhishu(ab)==0){
		return 0;
	}else{
		if(10>ab&&ab>4){
			return 1;
		}
		if(100>ab&&ab>9){
			if(weishu(ab,2)==weishu(ab,1)){
			return 1;
			}
		}
		if(1000>ab&&ab>99){
			if(weishu(ab,3)==weishu(ab,1)){
			return 1;
			}
		}
		if(10000>ab&&ab>999){
			if(weishu(ab,4)==weishu(ab,1)&&weishu(ab,3)==weishu(ab,2)){
			return 1;
			}
		}
		if(100000>ab&&ab>9999){
			if(weishu(ab,5)==weishu(ab,1)&&weishu(ab,4)==weishu(ab,2)){
			return 1;
			}
		}
		if(1000000>ab&&ab>99999){
			if(weishu(ab,6)==weishu(ab,1)&&weishu(ab,5)==weishu(ab,2)&&weishu(ab,4)==weishu(ab,3)){
			return 1;
			}
		}
		if(10000000>ab&&ab>999999){
			if(weishu(ab,7)==weishu(ab,1)&&weishu(ab,6)==weishu(ab,2)&&weishu(ab,5)==weishu(ab,3)){
			return 1;
			}
		}
		if(100000000>ab&&ab>9999999){
			if(weishu(ab,8)==weishu(ab,1)&&weishu(ab,7)==weishu(ab,2)&&weishu(ab,6)==weishu(ab,3)&&weishu(ab,5)==weishu(ab,4)){
			return 1;
			}
		}else{
			return 0;
		}
	}
}
int main()
{
	int l,n;
	scanf("%d %d",&l,&n);
	for(int ib=l;ib<n;ib++){
		if(hwzs(ib)==1){
			printf("%d\n",ib);
		}
	}
}