import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();
		
		if(n/100 > 0 && n/100 < 13) {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("AMBIGUOUS");
			}else {
				System.out.println("MMYY");
			}
		}else {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("YYMM");
			}else {
				System.out.println("NA");
			}
		}

	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();
		
		if(n/100 > 0 && n/100 < 13) {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("AMBIGUOUS");
			}else {
				System.out.println("MMYY");
			}
		}else {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("YYMM");
			}else {
				System.out.println("NA");
			}
		}

	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();
		
		if(n/100 > 0 && n/100 < 13) {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("AMBIGUOUS");
			}else {
				System.out.println("MMYY");
			}
		}else {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("YYMM");
			}else {
				System.out.println("NA");
			}
		}

	} main {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();
		
		if(n/100 > 0 && n/100 < 13) {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("AMBIGUOUS");
			}else {
				System.out.println("MMYY");
			}
		}else {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("YYMM");
			}else {
				System.out.println("NA");
			}
		}

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc sc.close() sc.close sc if(n/100 > 0 && n/100 < 13) {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("AMBIGUOUS");
			}else {
				System.out.println("MMYY");
			}
		}else {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("YYMM");
			}else {
				System.out.println("NA");
			}
		} n/100 > 0 && n/100 < 13 n/100 > 0 n/100 n 100 0 n/100 < 13 n/100 n 100 13 {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("AMBIGUOUS");
			}else {
				System.out.println("MMYY");
			}
		} if(n%100 > 0 && n%100 < 13) {
				System.out.println("AMBIGUOUS");
			}else {
				System.out.println("MMYY");
			} n%100 > 0 && n%100 < 13 n%100 > 0 n%100 n 100 0 n%100 < 13 n%100 n 100 13 {
				System.out.println("AMBIGUOUS");
			} System.out.println("AMBIGUOUS") System.out.println System.out System System.out "AMBIGUOUS" {
				System.out.println("MMYY");
			} System.out.println("MMYY") System.out.println System.out System System.out "MMYY" {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("YYMM");
			}else {
				System.out.println("NA");
			}
		} if(n%100 > 0 && n%100 < 13) {
				System.out.println("YYMM");
			}else {
				System.out.println("NA");
			} n%100 > 0 && n%100 < 13 n%100 > 0 n%100 n 100 0 n%100 < 13 n%100 n 100 13 {
				System.out.println("YYMM");
			} System.out.println("YYMM") System.out.println System.out System System.out "YYMM" {
				System.out.println("NA");
			} System.out.println("NA") System.out.println System.out System System.out "NA" String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();
		
		if(n/100 > 0 && n/100 < 13) {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("AMBIGUOUS");
			}else {
				System.out.println("MMYY");
			}
		}else {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("YYMM");
			}else {
				System.out.println("NA");
			}
		}

	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();
		
		if(n/100 > 0 && n/100 < 13) {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("AMBIGUOUS");
			}else {
				System.out.println("MMYY");
			}
		}else {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("YYMM");
			}else {
				System.out.println("NA");
			}
		}

	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();
		
		if(n/100 > 0 && n/100 < 13) {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("AMBIGUOUS");
			}else {
				System.out.println("MMYY");
			}
		}else {
			if(n%100 > 0 && n%100 < 13) {
				System.out.println("YYMM");
			}else {
				System.out.println("NA");
			}
		}

	}

}
