S = int(input())

a = S//100
b = S%100

if 1<=a<=12 and 1<=b<=12:
    print('AMBIGUOUS')
elif 1<=a<=12 and (b>12 or b==0):
    print('MMYY')
elif (a==0 or a>12) and 1<=b<=12:
    print('YYMM')
else:
    print('NA') S = int(input()) S int(input()) int input() input a = S//100 a S//100 S 100 b = S%100 b S%100 S 100 if 1<=a<=12 and 1<=b<=12:
    print('AMBIGUOUS')
elif 1<=a<=12 and (b>12 or b==0):
    print('MMYY')
elif (a==0 or a>12) and 1<=b<=12:
    print('YYMM')
else:
    print('NA') 1<=a<=12 and 1<=b<=12 1<=a<=12 1<=a 1 a 12 1<=b<=12 1<=b 1 b 12 print('AMBIGUOUS') print 'AMBIGUOUS' elif 1<=a<=12 and (b>12 or b==0):
    print('MMYY') 1<=a<=12 and (b>12 or b==0) 1<=a<=12 1<=a 1 a 12 b>12 or b==0 b>12 b 12 b==0 b 0 print('MMYY') print 'MMYY' elif (a==0 or a>12) and 1<=b<=12:
    print('YYMM') (a==0 or a>12) and 1<=b<=12 a==0 or a>12 a==0 a 0 a>12 a 12 1<=b<=12 1<=b 1 b 12 print('YYMM') print 'YYMM' print('NA') print 'NA' S = int(input()) int(input()) S b = S%100 S%100 b a = S//100 S//100 a
S = int(input())

a = S//100
b = S%100

if 1<=a<=12 and 1<=b<=12:
    print('AMBIGUOUS')
elif 1<=a<=12 and (b>12 or b==0):
    print('MMYY')
elif (a==0 or a>12) and 1<=b<=12:
    print('YYMM')
else:
    print('NA')
