#include <iostream>

using namespace std;

bool is_palindrom(int number);

int main() {

	int number;
le (number > 0) {
                inverse *= 10;
                aux = number % (i * 10);
                inverse += aux / i;
                i *= 10;
        }

        if (inverse == original) return true;
        return false;
}

	cin >> number;

	if (is_palindrom(number)) cout << "sim";
	else cout << "nao";

	return 0;
}

bool is_palindrom(int number) {
	int inverse = 0, original = 0;
	int aux = 0, i = 1;
	if (number % 10 == 0) return false;
	while (number > 0) {
		inverse *= 10;
		aux = number % (i * 10);
		inverse += aux / i;
		i *= 10;
	}

	if (inverse == original) return true;
	return false;
}
le (number > 0) {
                inverse *= 10;
                aux = number % (i * 10);
                inverse += aux / i;
                i *= 10;
        }

        if (inverse == original) return true;
        return false;
}