def is_impossible(flag):
    if flag:
        print(-1)
        exit()


W, H, X = map(int, input().split())
M = [[0] * W for _ in range(H)]
if X <= 9:
    for i in range(1, H, 3):
        for j in range(1, W, 3):
            M[i][j] = X
else:
    is_impossible(X > 36)
    is_impossible(W % 3 != 2 or W % 3 != 2)

    for i in range(0, H, 3):
        for j in range(0, W, 3):
            M[i][j] = X // 4
            M[i][j + 1] = (X + 1) // 4
            M[i + 1][j] = (X + 2) // 4
            M[i + 1][j + 1] = (X + 3) // 4
for m in M:
    print(''.join(map(str, m)))