import re
s = input()
if re.search(r'OOO',s) and re.search(r'XXX',s):
    m = re.search(r'OOO',s)
    n = re.search(r'XXX',s)
    if m.start() > n.start():
        print("West")
    else:
        print("East")
elif re.search(r'OOO',s):
    print("East")
elif re.search(r'XXX',s):
    print("West")
else:
    print("NA")