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 (3.4.3) (judge verdict: Wrong Answer)

s = str(input())
s_a = s[:2]
s_b = s[2:]
def cale(t):
  result_list = []
  if int(t) > 0 and int(t) < 13:
    result_list.append('MM')
  elif int(t) > 0 and int(t) <100:
    result_list.append('YY')
  else:
    result_list.append('NA')
  return result_list

s_a_re = cale(s_a)
s_b_re = cale(s_b)

if s_a_re[0] in 'N' or s_b_re[0] in 'N':
  print('NA')
elif s_a_re[0] == s_b_re[0]:
  print('AMBIGUOUS')
else:
  aws = s_a_re[0] + s_b_re[0]
  print(aws)