W, H, X = map(int ,input().split())
ans = [[-1] * (W + 2) for _ in range(H + 2)]
val = (1 + int(H%3==2)) * (1 + int(W%3==2)) * 9
if X > val:
    print(-1)
    exit()
    
for i in range(H + 2):
    for j in range(W + 2):
        if i % 3 == 0 or (H + 1 - i) % 3 == 0 or j % 3 == 0 or (W + 1 - j) % 3 == 0:
            ans[i][j] = 0
            
for i in range(3):
    for j in range(3):
        if ans[i][j] == 0:
            continue
        v = min(9, X)
        X -= v
        ans[i][j] = v
        
for i in range(H + 2):
    for j in range(W + 2):
        ans[i][j] = ans[i%3][j%3]
        
for i in range(1, H + 1):
    print(*ans[i][1:-1], sep="")