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 Python (3.8.2) (judge verdict: Accepted)

S = input()
YYMM = 0
MMYY = 0
start = S[0:2]
end = S[2:4]
tmp1 = int(start)
tmp2 = int(end)
if(tmp2 <= 12 and tmp2 != 0):
    YYMM = 1
if(tmp1 <= 12 and tmp1 != 0):
    MMYY = 1
if(YYMM == 1 and MMYY == 1):
    print("AMBIGUOUS")
elif(YYMM == 1):
    print("YYMM")
elif(MMYY == 1):
    print("MMYY")
else:
    print("NA")