s = input()
east, west = 0, 0
for x in s:
    if x == "O":
        east += 1
        west = 0
    else:
        east = 0
        west += 1
    if east == 3:
        print("East")
        break
    if west == 3:
        print("West")
        break
else:
    print("NA")