dat = input().split()
for i in range(int(dat[1])):
    tmp = ''
    for j in range(int(dat[0])):
        tmp += dat[2]
        if(dat[2] == 'B'):
            dat[2] = 'W'
        else:
            dat[2] = 'B'
    print(tmp)
    if(int(dat[0]) % 2 == 0):
        if(dat[2] == 'B'):
            dat[2] = 'W'
        else:
            dat[2] = 'B'