s = input()
east_count = 0
west_count = 0

for i in s:
    if (east_count >= 3) or (west_count >= 3):
        break
    elif i == 'O':
        east_count += 1
        west_count = 0
    elif i == 'X':
        east_count = 0
        west_count += 1
if (east_count <= 2) and (west_count <= 2):
    print('NA')
elif east_count > west_count:
    print('East')
elif east_count < west_count:
    print('West')