# coding: utf-8
e = w = 0
for x in input():
    if x == "O":
        e += 1
        w = 0
    else:
        w += 1
        e = 0
    if e == 3 or w == 3:
        break
if e == 3:
    print("East")
elif w == 3:
    print("West")
else:
    print("NA")