大佬帮帮忙！

#include <bits/stdc++.h>
using namespace std;
int ss(int x) {
	if(x <= 1)
		return 0;
	if(x == 2)
		return 1;
	for (int i = 2; i < x; i++)
		if(x % i == 0) 
			return 0;
	return 1;
}
int main() {
	long long n, m, s = 0;
	scanf("%lld%lld", &n, &m);
	for (long long i = n; i <= m; i++) {
		long long j = i;
		s = 0;
		while (j != 0) {
			s = s * 10 + j % 10;
			j /= 10; 
		}
		if(s == i && ss(i) == 1)
			printf("%lld\n", i);
	}
    return 0;
}