n = 1221
d = n % 10
n = (n - n % 10) // 10
c = n % 10
n = (n - n % 10) // 10
b = n % 10
n = (n - n % 10) // 10
a = n
if a == 0 and d == b and c != d:
   print("DA")
elif a == 0 and d == b:
    print("NU")
elif a != 0 and d == a and c == b:
    print("DA")
elif a!= 0 and d != a and c == b:
    print("APROAPE")
elif a!= 0 and d != a:
    print("NU")