S = input()
l = list(S)
flg = 0
if len(l) < 3:
    print("NA")
    flg = 1

else:
    for i in range(len(l) - 2):
        if l[i] == l[i+1] == l[i+2]:
            if l[i]  == "O":
                print("East")
                flg = 1

            else:
                print("West")
                flg = 1
            break

if flg == 0:
    print ("NA")