S=list(input())
for i in range(1,len(S)-1):
    if S[i-1]=="X" and S[i]=="X" and S[i+1]=="X":
        print("West");exit()
    elif S[i-1]=="O" and S[i]=="O" and S[i+1]=="O":
        print("East");exit()
print("NA")