#include<bits/stdc++.h>

using namespace std;

//回文数的写法
bool isHWS(int num) {
    int t = num, ans = 0;
    while (t) {
        ans = ans * 10 + t % 10;
        t /= 10;
    }
    return ans == num;
}

int main() {
    for (int i = 1; i <= 1000; i++) {
        if (isHWS(i))
            cout << i << endl;
    }
    return 0;
}