// PR Bab 06, soal 4 -- pembahasan.

#include <iostream>
using namespace std;

long long balik(long long n) {
    long long hasil = 0;
    while (n > 0) {
        hasil = hasil * 10 + n % 10;
        n /= 10;
    }
    return hasil;
}

int main() {
    long long n;
    cin >> n;

    if (balik(n) == n) cout << "YA\n";
    else cout << "TIDAK\n";

    return 0;
}