回文质数88分，SOS！！！

#include<cstdio>
#include<iostream>
#include<cstring>
#include<cmath>
using namespace std;
int n, m;
bool hw(int);//回文
bool ss(int);//素数
int main()
{
    int i;
    scanf("%d%d", &n, &m);
    if (n % 2 == 0) n += 1;
    if (m % 2 == 0) m -= 1;
    for (i = n;i <= m;i += 2) {
        if (hw(i) && ss(i))  printf("%d\n", i);
    }
    return 0;
}
bool hw(int a)
{
    int x = 0, y;
    char str[15] = {} ;
    while (a != 0) {
        str[x] = char(a % 10 + 48);
        a = a / 10;
        x++;
    }
    y = strlen(str)-1;
    x = 0;
    while (x <= y) {
        if (str[x] == str[y]) {
            x++;
            y--;
        }    
        else return false;
    }
    return true;
}
bool ss(int a)
{
    int i;
    for (i = 2;i <= trunc(sqrt(a));i++) {
        if (a%i == 0) return false;
    }
    return true;
}