import sys

line = input()

east = "OOO"
west = "XXX"

east_index = line.find(east)
west_index = line.find(west)

if east_index == -1 and west_index == -1:
    print("NA")
    sys.exit()

if east_index == -1 and west_index != -1:
    print("West")
    sys.exit()

if east_index != -1 and west_index == -1:
    print("East")
    sys.exit()

if east_index > west_index:
    print("West")
else:
    print("East")