match_result = list(input())


match_times = len(match_result)
east, west = 0, 0

i = 0
while i < match_times:
    if (match_result[i] == "O"):
        east += 1
        west = 0
        if (east == 3):
            break
    else:
        west += 1
        east = 0
        if (west == 3):
            break
    i +=1


if (east == 3):
    answer = "East"    
elif(west == 3):
    answer = "West"
else:
    answer = "NA"

print(answer)