s = str(input())
n = len(s)
cnt = 0
cur = ''
for i in range(n):
    if s[i] != cur:
        cnt = 1
        cur = s[i]
    else:
        cnt += 1
    if cnt == 3:
        if cur == 'O':
            print('East')
        else:
            print('West')
        exit()
else:
    print('NA')