koordvvod = input()

bukva = koordvvod[0]
tsifra = int(koordvvod[1])

atoone = {"A": 1, "B": 2, "C": 3, "D": 4, "E": 5, "F": 6, "G": 7, "H": 8}

koord1 = atoone[bukva]
koord2 = tsifra

tsvet = ""

if koord1/2 != koord1//2 and koord2/2 != koord2//2:
    tsvet = "BLACK"

elif koord1/2 != koord1//2 and koord2/2 == koord2//2:
    tsvet = "WHITE"

elif koord1/2 == koord1//2 and koord2/2 != koord2//2:
    tsvet = "WHITE"

elif koord1/2 == koord1//2 and koord2/2 == koord2//2:
    tsvet = "BLACK"

print(tsvet)