s = input()

a, b = int(s[:2]), int(s[2:])
if 0 < a < 13 and 0 < b < 13:
    print('AMBIGUOUS')
elif 0 < a < 13:
    print('MMYY')
elif 0 < b < 13:
    print('YYMM')
else:
    print("NA") s = input() s input() input a, b = int(s[:2]), int(s[2:]) a int(s[:2]) int s[:2] s :2 2 b int(s[2:]) int s[2:] s 2: 2 if 0 < a < 13 and 0 < b < 13:
    print('AMBIGUOUS')
elif 0 < a < 13:
    print('MMYY')
elif 0 < b < 13:
    print('YYMM')
else:
    print("NA") 0 < a < 13 and 0 < b < 13 0 < a < 13 0 < a 0 a 13 0 < b < 13 0 < b 0 b 13 print('AMBIGUOUS') print 'AMBIGUOUS' elif 0 < a < 13:
    print('MMYY') 0 < a < 13 0 < a 0 a 13 print('MMYY') print 'MMYY' elif 0 < b < 13:
    print('YYMM') 0 < b < 13 0 < b 0 b 13 print('YYMM') print 'YYMM' print("NA") print "NA" b = int(s[:2]), int(s[2:]) int(s[2:]) b s = input() input() s a, b = int(s[:2]), int(s[2:]) int(s[:2]) a
s = input()

a, b = int(s[:2]), int(s[2:])
if 0 < a < 13 and 0 < b < 13:
    print('AMBIGUOUS')
elif 0 < a < 13:
    print('MMYY')
elif 0 < b < 13:
    print('YYMM')
else:
    print("NA")
