S=input()
x=int(S[:2])
y=int(S[2:])

if 1<=x<=12 and 1<=y<=12:
    print("AMBIGUOUS")
elif 1<=x<=12:
    print("MMYY")
elif 1<=y<=12:
    print("YYMM")
else:
    print("NA") S=input() S input() input x=int(S[:2]) x int(S[:2]) int S[:2] S :2 2 y=int(S[2:]) y int(S[2:]) int S[2:] S 2: 2 if 1<=x<=12 and 1<=y<=12:
    print("AMBIGUOUS")
elif 1<=x<=12:
    print("MMYY")
elif 1<=y<=12:
    print("YYMM")
else:
    print("NA") 1<=x<=12 and 1<=y<=12 1<=x<=12 1<=x 1 x 12 1<=y<=12 1<=y 1 y 12 print("AMBIGUOUS") print "AMBIGUOUS" elif 1<=x<=12:
    print("MMYY") 1<=x<=12 1<=x 1 x 12 print("MMYY") print "MMYY" elif 1<=y<=12:
    print("YYMM") 1<=y<=12 1<=y 1 y 12 print("YYMM") print "YYMM" print("NA") print "NA" y=int(S[2:]) int(S[2:]) y x=int(S[:2]) int(S[:2]) x S=input() input() S
S=input()
x=int(S[:2])
y=int(S[2:])

if 1<=x<=12 and 1<=y<=12:
    print("AMBIGUOUS")
elif 1<=x<=12:
    print("MMYY")
elif 1<=y<=12:
    print("YYMM")
else:
    print("NA")