N,K = list(map(int,input().split()))
sr,sc = list(map(lambda x:int(x)-1,input().split()))
tr,tc = list(map(lambda x:int(x)-1,input().split()))

dist = abs(sr - tr) + abs(sc - tc)
if(dist%2 != K%2):
    print(-1)
    exit()

if not (dist <= K <= 2*dist):
    print(-1)
    exit()

need = K - dist
ans = [["." for j in range(N)] for i in range(N)]

for i in range(N):
    for j in range(N):
        if(abs(tr - i) + abs(tc - j) > need):continue
        ans[i][j] = "." if (abs(tr - i) + abs(tc - j)) % 2 == 0 else "#"

for i in ans:
    print("".join(i))