#include <iostream>
using namespace std;

const int TEN = 10;

int main() {
    int n, firstDigit, secondDigit, thirdDigit;
    cin >> n;
    thirdDigit = n % TEN;
    secondDigit = n / TEN % TEN;
    firstDigit = n / TEN / TEN;
    if (firstDigit == secondDigit - 1 && firstDigit == thirdDigit - 2) {
        cout << "SUNT";
    } else {
        cout << "NU SUNT";
    }
    return 0;
}