d = {0:1,1:0,2:-1}
w,h,x = map(int,input().split())
ans = [[0]*w for _ in range(h)]
s = (2 if h%3==2 else 1)*(2 if w%3==2 else 1)
if s*9 < x:
    print(-1)
    exit()
a = x//s
if s==1:
    for i in range(h):
        if i%3 != d[h%3]: continue
        for j in range(w):
            if j%3 != d[w%3]: continue
            ans[i][j] = a
if s==2:
    V = x%2
    if h%3==2:
        for i in range(h):
            if i%3 == 2: continue
            for j in range(w):
                if j%3 != d[w%3]: continue
                ans[i][j] = a + (i%3==0)*V
    else:
        for i in range(h):
            if i%3 != d[h%3]: continue
            for j in range(w):
                if j%3 == 2: continue
                ans[i][j] = a + (j%3==0)*V

if s==4:
    d = {(0,0):0,(0,1):(x%4>=3),(1,0):(x%4>=2),(1,1):(x%4>=1)}
    for i in range(h):
        if i%3 == 2: continue
        for j in range(w):
            if j%3 == 2: continue
            ans[i][j] = a + d[i%3,j%3]

for i in ans:
    print("".join(map(str,i)))