w,h,x = map(int,input().split())
if x>9:
    print(-1)
else:
    m = [[0 for _ in range(w)]for __ in range(h)]
    for i in range(1,h,3):
        for j in range(1,w,3):
            m[i][j] = x
    if w%3 == 1:
        for i in range(1,h,3):
            m[i][-1] = x
    if h%3 == 1:
        for i in range(1,w,3):
            m[-1][i] = x
    for i in range(h):
        for j in range(w):
            print(m[i][j],end = "")
        print()