S = input()
if  not("OOO" in S) and not("XXX" in S):
    print("NA")
    
else:
    for i in range(len(S)-1):
        if S[i:i+3] == "OOO" :
            print("East")
            break
        elif S[i:i+3] == "XXX" :
            print("Wast")
            break