S = list(input())
m,b,mb = 0,0,0
while m !=3 and b != 3 and mb != len(S):
    if S[mb] == "O":
        m += 1
        b = 0
    elif S[mb] == "X":
        m = 0
        b += 1
    mb += 1
if m == 3:
    print("East")
elif b == 3:
    print("West")
else:
    print("NA")