// Program 71: Increasing, Decreasing or Bouncy Number

import java.util.*;
class NumberTrend {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        if (!s.matches("[1-9][0-9]*")) {
            System.out.println("INVALID INPUT");
            return;
        }
    boolean inc = true, dec = true;
    for (int i = 1; i < s.length(); i++) {
        if (s.charAt(i) < s.charAt(i - 1)) {
            inc = false;
        }
    if (s.charAt(i) > s.charAt(i - 1)) {
        dec = false;
    }
}
if (inc) {
    System.out.println("INCREASING NUMBER");
}
else if (dec) {
    System.out.println("DECREASING NUMBER");
}
else {
    System.out.println("BOUNCY NUMBER");
}
}
}