import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in)) {
			int s = sc.nextInt();
			int a = s / 100;
			int b = s % 100;

			if ((a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12)) {
				System.out.println("NA");
			} else if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			}
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in)) {
			int s = sc.nextInt();
			int a = s / 100;
			int b = s % 100;

			if ((a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12)) {
				System.out.println("NA");
			} else if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			}
		}
	}
} Main public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in)) {
			int s = sc.nextInt();
			int a = s / 100;
			int b = s % 100;

			if ((a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12)) {
				System.out.println("NA");
			} else if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			}
		}
	} main {
		try (Scanner sc = new Scanner(System.in)) {
			int s = sc.nextInt();
			int a = s / 100;
			int b = s % 100;

			if ((a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12)) {
				System.out.println("NA");
			} else if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			}
		}
	} try (Scanner sc = new Scanner(System.in)) {
			int s = sc.nextInt();
			int a = s / 100;
			int b = s % 100;

			if ((a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12)) {
				System.out.println("NA");
			} else if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			}
		} {
			int s = sc.nextInt();
			int a = s / 100;
			int b = s % 100;

			if ((a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12)) {
				System.out.println("NA");
			} else if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			}
		} Scanner sc = new Scanner(System.in) Scanner sc = new Scanner(System.in) new Scanner(System.in) int s = sc.nextInt(); s sc.nextInt() sc.nextInt sc int a = s / 100; a s / 100 s 100 int b = s % 100; b s % 100 s 100 if ((a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12)) {
				System.out.println("NA");
			} else if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			} (a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12) (a > 12 && b == 0) (a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12) (a == 0 && b == 0) a == 0 a 0 b == 0 b 0 (a == 0 && b > 12) a == 0 a 0 b > 12 b 12 (a > 12 && b == 0) a > 12 a 12 b == 0 b 0 (a > 12 && b > 12) a > 12 a 12 b > 12 b 12 {
				System.out.println("NA");
			} System.out.println("NA") System.out.println System.out System System.out "NA" if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			} (a == 0 || a > 12) && 1 <= b && b <= 12 (a == 0 || a > 12) && 1 <= b && b <= 12 (a == 0 || a > 12) a == 0 a 0 a > 12 a 12 1 <= b 1 b b <= 12 b 12 {
				System.out.println("YYMM");
			} System.out.println("YYMM") System.out.println System.out System System.out "YYMM" if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			} 1 <= a && a <= 12 && (b == 0 || b > 12) 1 <= a && a <= 12 && (b == 0 || b > 12) 1 <= a 1 a a <= 12 a 12 (b == 0 || b > 12) b == 0 b 0 b > 12 b 12 {
				System.out.println("MMYY");
			} System.out.println("MMYY") System.out.println System.out System System.out "MMYY" if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			} 1 <= a && a <= 12 && 1 <= b && b <= 12 1 <= b 1 <= a && a <= 12 && 1 <= b && b <= 12 1 <= a 1 a a <= 12 a 12 1 <= b 1 b b <= 12 b 12 {
				System.out.println("AMBIGUOUS");
			} System.out.println("AMBIGUOUS") System.out.println System.out System System.out "AMBIGUOUS" String[] args args public class Main {
	public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in)) {
			int s = sc.nextInt();
			int a = s / 100;
			int b = s % 100;

			if ((a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12)) {
				System.out.println("NA");
			} else if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			}
		}
	}
} public class Main {
	public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in)) {
			int s = sc.nextInt();
			int a = s / 100;
			int b = s % 100;

			if ((a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12)) {
				System.out.println("NA");
			} else if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			}
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in)) {
			int s = sc.nextInt();
			int a = s / 100;
			int b = s % 100;

			if ((a == 0 && b == 0) || (a == 0 && b > 12) || (a > 12 && b == 0) || (a > 12 && b > 12)) {
				System.out.println("NA");
			} else if ((a == 0 || a > 12) && 1 <= b && b <= 12) {
				System.out.println("YYMM");
			} else if (1 <= a && a <= 12 && (b == 0 || b > 12)) {
				System.out.println("MMYY");
			} else if (1 <= a && a <= 12 && 1 <= b && b <= 12) {
				System.out.println("AMBIGUOUS");
			}
		}
	}
}