S = input()
s = list(S)
i = 0
if len(s) <= 2:
    print("NA")
else:
    while i < len(s)-2:
        if s[i] == s[i+1] == s[i+2]:
            if s[i] == "O":
                print("East")
            else:
                print("West")
            break
        i += 1
    else:
        print("NA")