import java.util.*;
public class Main {
    public static void main(String[] args) {

		Scanner s = new Scanner((System.in));
		int n = s.nextInt();
		int fh = n / 100;
		int sh = n % 100;

		System.out.println(isMonth(fh) ? (isMonth(sh) ? "AMBIGUOUS " : "MMYY") : (isMonth(sh) ? "YYMM" : "NA"));

    }

    public static Boolean isMonth(int i){
    	return (1 <= i) && (i <= 12);
	}


}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz