s = input()
if (int(s[:2]) == 0 or int(s[:2]) > 12)&(0 < int(s[2:]) <= 12):
    print("YYMM")
    
elif (0 < int(s[:2]) <= 12)&(int(s[2:]) == 0 or int(s[2:]) > 12):
    print("MMYY")

elif (0 < int(s[:2]) <= 12)&(0 < int(s[2:]) <= 12):
    print("AMBIGUOUS")

else:
    print("NA") s = input() s input() input if (int(s[:2]) == 0 or int(s[:2]) > 12)&(0 < int(s[2:]) <= 12):
    print("YYMM")
    
elif (0 < int(s[:2]) <= 12)&(int(s[2:]) == 0 or int(s[2:]) > 12):
    print("MMYY")

elif (0 < int(s[:2]) <= 12)&(0 < int(s[2:]) <= 12):
    print("AMBIGUOUS")

else:
    print("NA") (int(s[:2]) == 0 or int(s[:2]) > 12)&(0 < int(s[2:]) <= 12) int(s[:2]) == 0 or int(s[:2]) > 12 int(s[:2]) == 0 int(s[:2]) int s[:2] s :2 2 0 int(s[:2]) > 12 int(s[:2]) int s[:2] s :2 2 12 0 < int(s[2:]) <= 12 0 < int(s[2:]) 0 int(s[2:]) int s[2:] s 2: 2 12 print("YYMM") print "YYMM" elif (0 < int(s[:2]) <= 12)&(int(s[2:]) == 0 or int(s[2:]) > 12):
    print("MMYY") (0 < int(s[:2]) <= 12)&(int(s[2:]) == 0 or int(s[2:]) > 12) 0 < int(s[:2]) <= 12 0 < int(s[:2]) 0 int(s[:2]) int s[:2] s :2 2 12 int(s[2:]) == 0 or int(s[2:]) > 12 int(s[2:]) == 0 int(s[2:]) int s[2:] s 2: 2 0 int(s[2:]) > 12 int(s[2:]) int s[2:] s 2: 2 12 print("MMYY") print "MMYY" elif (0 < int(s[:2]) <= 12)&(0 < int(s[2:]) <= 12):
    print("AMBIGUOUS") (0 < int(s[:2]) <= 12)&(0 < int(s[2:]) <= 12) 0 < int(s[:2]) <= 12 0 < int(s[:2]) 0 int(s[:2]) int s[:2] s :2 2 12 0 < int(s[2:]) <= 12 0 < int(s[2:]) 0 int(s[2:]) int s[2:] s 2: 2 12 print("AMBIGUOUS") print "AMBIGUOUS" print("NA") print "NA" s = input() input() s
s = input()
if (int(s[:2]) == 0 or int(s[:2]) > 12)&(0 < int(s[2:]) <= 12):
    print("YYMM")
    
elif (0 < int(s[:2]) <= 12)&(int(s[2:]) == 0 or int(s[2:]) > 12):
    print("MMYY")

elif (0 < int(s[:2]) <= 12)&(0 < int(s[2:]) <= 12):
    print("AMBIGUOUS")

else:
    print("NA")