import sys

sys.setrecursionlimit(10**6)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.buffer.readline())
def FI(): return float(sys.stdin.buffer.readline())
def MI(): return map(int, sys.stdin.buffer.readline().split())
def MF(): return map(float, sys.stdin.buffer.readline().split())
def MI1(): return map(int1, sys.stdin.buffer.readline().split())
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def LI1(): return list(map(int1, sys.stdin.buffer.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def BI(): return sys.stdin.buffer.readline().rstrip()
def SI(): return sys.stdin.buffer.readline().rstrip().decode()
dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
inf = 10**16
# md = 998244353
md = 10**9+7

w,h,x=MI()
tt=[[0]*w for _ in range(h)]
unit=[[1,1,0],[1,1,0],[0,0,0]]
for j in range(3):unit[h%3][j]=0
for j in range(3):unit[j][w%3]=0
# p2D(unit)

for i in range(2):
    for j in range(2):
        if unit[i][j]:
            cur=min(x,9)
            unit[i][j]=cur
            x-=cur

if x:
    print(-1)
    exit()

for i in range(h):
    for j in range(w):
        tt[i][j]=unit[i%3][j%3]

for row in tt:print(*row,sep="")