s = input()

for i in range(len(s)-2):
    if s[i] == "O":
        if s[i+1] == "O" and s[i+2] == "O":
            print("East")
            exit()

    else:
        if s[i+1] == "X" and s[i+2] == "X":
            print("West")
            exit()

print("NA")