#!/usr/bin/env python3

s = input()
e = s.find("OOO")
w = s.find("XXX")
if e < 0 and w < 0:
    print("NA")
elif e < 0 and w >= 0:
    print("West")
elif e >= 0 and w < 0:
    print("East")
elif e < w:
    print("East")
else:
    print("West")