w,h,x = map(int,input().split())
def ans(w,h,x):
    if x > 36:
        return -1
    if w == h == 1:
        if x > 10:
            return -1
        return [x]
    if w == 1:
        if x > 18 or x%2 :
            return -1
        if h%3 != 2:
            return -1
        l = [[x//2] for i in range(h)]
        for i in range(2,h,3):
            l[i][0] = 0
        return l
    if h == 1:
        if x > 18 or x%2 :
            return -1
        if w%3 != 2:
            return -1
        l = [[x//2]*w]
        for i in range(2,w,3):
            l[0][i] = 0
        return l
    if h == w == 2:
        if x > 36:
            return -1
        l = [[0,0],[0,0]]
        for i in range(2):
            for j in range(2):
                a = min(9,x)
                l[i][j] = a
                x -= a
        return l
        
    if h%3 != 2 or w%3 != 2:
        return -1
    if x > 36 or x%4:
        return -1
    l = []
    base = [x//4]*w
    for i in range(2,w,3):
        base[i] = 0
    for i in range(h):
        if i%3 == 2:
            l.append([0]*w)
        else:
            l.append(base)
    return l

a = ans(w,h,x)
if a == -1:
    print(a)
    exit()
for i in a:
    print(*i,sep="")