banana

#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;
bool banana(int n) {
if(n == 1) return false;
for(long long i = 2; i * i <= n; i++) {
if(n % i == 0) return false;
}
return true;
}
int nababa(int n) {
int s = 0, y = n;
while(n != 0) {
s = 10 * s + n % 10;
n /= 10;
}

return y == s;

}
int main(){
int a, b;
cin >> a >> b;
for(int i = a; i < b; i++) {
if(nababa(i) && banana(i)) {
cout << i << endl;
}
}

return 0;

}