# input.txt → avtor bergan input
# author.txt → avtor bergan output
# code.txt → userning kodi
# user.txt → user bergan output
ac = 0xAC
wa = 0xAD
pe = 0xAE
tl = 0xAF
author_input = open("input.txt", "r")
#author_output = open("author.txt", "r")
user_output = open("user.txt", "r")
#user_code = open("code.txt", "r")

def close(x):
   author_input.close()
   #author_output.close()
   user_output.close()
   #user_code.close()
   exit(x)

def main():
   # a + b misol uchun checker
   x="".join(author_input).split()
   a,b=map(int,x)
   try:
       #ans = int(author_output.readline())
       user_ans = int(user_output.readline())
       if user_ans == a-b or user_ans == a+b:
           exit(close(ac))
       else:
           close(wa)
   except Exception as e:
       close(pe)

if __name__ == "__main__":
   main()