// Monotonic Sequence
//
import java.util.Scanner;

public class Program3
{
	public static void main(String[] args)
	{
		Scanner scan= new Scanner(System.in);
		int[] s = {1, 2, 4, 5, 7, 8, 9, 12, 15};
		//int[] s = {1, 2, 4, 5, 3, 8, 9, 12, 15};
		 
		int idx=-1; // index of the fists entry which breaks the monotinicity
		for(int i=1; i< s.length; i++)
		{
			if(s[i] < s[i-1])
			{
				idx=i;
				break;				
			}
		} 

		if(idx != -1){
			System.out.println("The sequence is NOT monotonic.");
			System.out.println("The monotonicity is broken at index " + idx);
		}
		else
			System.out.print("The sequence is monotonic.");
	}
}