import java.util.*;
import java.io.*;
import java.lang.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        int a = Integer.parseInt(s.substring(0,2));
        int b = Integer.parseInt(s.substring(2,4));

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

        String s = sc.next();

        int a = Integer.parseInt(s.substring(0,2));
        int b = Integer.parseInt(s.substring(2,4));

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

        String s = sc.next();

        int a = Integer.parseInt(s.substring(0,2));
        int b = Integer.parseInt(s.substring(2,4));

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

        String s = sc.next();

        int a = Integer.parseInt(s.substring(0,2));
        int b = Integer.parseInt(s.substring(2,4));

        if ( (a>=1) && (a<=12) && (b>=1) && (b<=12) )
            System.out.println("AMBIGUOUS");
        else if ( (a>=1) && (a<=12) && ( (b==0) || (b>12) ) )
            System.out.println("MMYY");
        else if ( (b>=1) && (b<=12) && ( (a==0) || (a>12) ) )
            System.out.println("YYMM");
        else
            System.out.println("NA");
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc int a = Integer.parseInt(s.substring(0,2)); a Integer.parseInt(s.substring(0,2)) Integer.parseInt Integer s.substring(0,2) s.substring s 0 2 int b = Integer.parseInt(s.substring(2,4)); b Integer.parseInt(s.substring(2,4)) Integer.parseInt Integer s.substring(2,4) s.substring s 2 4 if ( (a>=1) && (a<=12) && (b>=1) && (b<=12) )
            System.out.println("AMBIGUOUS");
        else if ( (a>=1) && (a<=12) && ( (b==0) || (b>12) ) )
            System.out.println("MMYY");
        else if ( (b>=1) && (b<=12) && ( (a==0) || (a>12) ) )
            System.out.println("YYMM");
        else
            System.out.println("NA"); (a>=1) && (a<=12) && (b>=1) && (b<=12) (b>=1) (a>=1) && (a<=12) && (b>=1) && (b<=12) (a>=1) a 1 (a<=12) a 12 (b>=1) b 1 (b<=12) b 12 System.out.println("AMBIGUOUS") System.out.println System.out System System.out "AMBIGUOUS" if ( (a>=1) && (a<=12) && ( (b==0) || (b>12) ) )
            System.out.println("MMYY");
        else if ( (b>=1) && (b<=12) && ( (a==0) || (a>12) ) )
            System.out.println("YYMM");
        else
            System.out.println("NA"); (a>=1) && (a<=12) && ( (b==0) || (b>12) ) (a>=1) && (a<=12) && ( (b==0) || (b>12) ) (a>=1) a 1 (a<=12) a 12 ( (b==0) || (b>12) ) (b==0) b 0 (b>12) b 12 System.out.println("MMYY") System.out.println System.out System System.out "MMYY" if ( (b>=1) && (b<=12) && ( (a==0) || (a>12) ) )
            System.out.println("YYMM");
        else
            System.out.println("NA"); (b>=1) && (b<=12) && ( (a==0) || (a>12) ) (b>=1) && (b<=12) && ( (a==0) || (a>12) ) (b>=1) b 1 (b<=12) b 12 ( (a==0) || (a>12) ) (a==0) a 0 (a>12) a 12 System.out.println("YYMM") System.out.println System.out System System.out "YYMM" 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);

        String s = sc.next();

        int a = Integer.parseInt(s.substring(0,2));
        int b = Integer.parseInt(s.substring(2,4));

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

        String s = sc.next();

        int a = Integer.parseInt(s.substring(0,2));
        int b = Integer.parseInt(s.substring(2,4));

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

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();

        int a = Integer.parseInt(s.substring(0,2));
        int b = Integer.parseInt(s.substring(2,4));

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