"I have tried my best……

but……

why……

it is TLE but not AC……"

#include<iostream>
#include<cmath>
using namespace std;
bool zhishu(long long m){
	double a=sqrt(m);
	if(m<=1) return false;
	for(int i=2;i<=a;i++){
		if(m%i==0) return false;
	}
	return true;
}
bool huiwen(long long m){
	int a=m,b=0;
	while(a>0){
		b=10*b+a%10;
		a=a/10;
	}
	if(m==b) return true;
	else return false;
}
int main()
{
	long a,b;
	long long ans=0;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(zhishu(i)==1&&huiwen(i)==1){
			cout<<i<<endl;
		}
	}
    return 0;
}