Problem:
Score : 200 points

Problem Statement

You have a digit sequence S of length 4. You are wondering which of the following formats S is in:

YYMM format: the last two digits of the year and the two-digit representation of the month (example: 01 for January), concatenated in this order

MMYY format: the two-digit representation of the month and the last two digits of the year, concatenated in this order

If S is valid in only YYMM format, print YYMM; if S is valid in only MMYY format, print MMYY; if S is valid in both formats, print AMBIGUOUS; if S is valid in neither format, print NA.

Constraints

S is a digit sequence of length 4.

Input

Input is given from Standard Input in the following format:

S

Output

Print the specified string: YYMM, MMYY, AMBIGUOUS or NA.

Sample Input 1

1905

Sample Output 1

YYMM

May XX19 is a valid date, but 19 is not valid as a month. Thus, this string is only valid in YYMM format.

Sample Input 2

0112

Sample Output 2

AMBIGUOUS

Both December XX01 and January XX12 are valid dates. Thus, this string is valid in both formats.

Sample Input 3

1700

Sample Output 3

NA

Neither 0 nor 17 is valid as a month. Thus, this string is valid in neither format.

Solution in Fortran (gfortran v4.8.4) (judge verdict: Wrong Answer)

program kadai
	implicit none

	integer  ::  a,b,c
    integer  ::  flag1,flag2
    character(len=4)  ::  Q,X
    character(len=2)  ::  W
    character(len=9)  ::  Z
    flag1=0
    flag2=0
    
    read(*,*) a
    
    b=a/100
    c=a-b*100
    
    Q="YYMM"
    X="MMYY"
    Z="AMBIGUOUS"
    W="NA"
    if (0<c .and. c<13) then
    	flag1=1  !YYMM
    end if
    
    if (0<b .and. b<13) then
    	flag2=1  !MMYY
    end if
    
    if (flag1==0) then
    	if(flag2==1) then
        	write(*,'(a)') trim(Q)
        else
        	write(*,'(a)') trim(W)
        end if
    end if
    
    if (flag1==1) then
    	if(flag2==0) then
        	write(*,'(a)') trim(X)
        else
         	write(*,'(a)') trim(Z)
        end if
     end if
    
    
end program kadai