h,w,k=map(int,input().split())
if h==2 and w==2:
    if k==2:
        print(1,4)
        print(2,3)
        exit()
    elif k==1:
        print(1,2)
        print(3,4)
        exit()
import time
start=time.time()
if k==0:
    print(-1)
    exit()
import random
X=[]
for i in range(h):
    I=list(range(i*w+1,i*w+w+1))
    X.append(I)
for i in range(h):
    for j in range(w):
        if X[i][j]%2==0:
            X[i][j]=(h*w)//2*2+2-X[i][j]

V4=[(1,0),(-1,0),(0,1),(0,-1)]
V5=[(1,0),(-1,0),(0,1),(0,-1),(0,0)]
def cha(x,y):
    fg=True
    for V in V4:
        if 0<=x+V[0]<h and 0<=y+V[1]<w:
            if X[x+V[0]][y+V[1]]<X[x][y]:
                fg=False
    return fg
def chb(x,y):
    fg=True
    for V in V4:
        if 0<=x+V[0]<h and 0<=y+V[1]<w:
            if X[x+V[0]][y+V[1]]>X[x][y]:
                fg=False
    return fg


a=0
b=0
for i in range(h):
    for j in range(w):
        if cha(i,j):
            a+=1
        if chb(i,j):
            b+=1

while a!=k or b!=k:
    if time.time()-start>0.9:
        break
    x1,y1=random.randint(0,h-1),random.randint(0,w-1)
    x2,y2=random.randint(0,h-1),random.randint(0,w-1)
    if abs(x1-x2)+abs(y1-y2)<=1:
        continue
    prea,preb=a,b
    for V in V5:
        if 0<=x1+V[0]<h and 0<=y1+V[1]<w:
          if cha(x1+V[0],y1+V[1]):
            a-=1
        if 0<=x1+V[0]<h and 0<=y1+V[1]<w:
          if chb(x1+V[0],y1+V[1]):
            b-=1
        if 0<=x2+V[0]<h and 0<=y2+V[1]<w:
          if cha(x2+V[0],y2+V[1]):
            a-=1
        if 0<=x2+V[0]<h and 0<=y2+V[1]<w:
          if chb(x2+V[0],y2+V[1]):
            b-=1
    X[x1][y1],X[x2][y2]=X[x2][y2],X[x1][y1]
    for V in V5:
        if 0<=x1+V[0]<h and 0<=y1+V[1]<w:
          if cha(x1+V[0],y1+V[1]):
            a+=1
        if 0<=x1+V[0]<h and 0<=y1+V[1]<w:
          if chb(x1+V[0],y1+V[1]):
            b+=1
        if 0<=x2+V[0]<h and 0<=y2+V[1]<w:
          if cha(x2+V[0],y2+V[1]):
            a+=1
        if 0<=x2+V[0]<h and 0<=y2+V[1]<w:
          if chb(x2+V[0],y2+V[1]):
            b+=1
    if abs(prea-k)+abs(preb-k)<abs(a-k)+abs(b-k):
        X[x1][y1],X[x2][y2]=X[x2][y2],X[x1][y1]
        a=prea
        b=preb


if a==k and b==k:
    for I in X:
        print(*I)
    exit()
  
X=[]
for i in range(h):
    I=list(range(i*w+1,i*w+w+1))
    X.append(I)


V4=[(1,0),(-1,0),(0,1),(0,-1)]
V5=[(1,0),(-1,0),(0,1),(0,-1),(0,0)]
def cha(x,y):
    fg=True
    for V in V4:
        if 0<=x+V[0]<h and 0<=y+V[1]<w:
            if X[x+V[0]][y+V[1]]<X[x][y]:
                fg=False
    return fg
def chb(x,y):
    fg=True
    for V in V4:
        if 0<=x+V[0]<h and 0<=y+V[1]<w:
            if X[x+V[0]][y+V[1]]>X[x][y]:
                fg=False
    return fg


a=0
b=0
for i in range(h):
    for j in range(w):
        if cha(i,j):
            a+=1
        if chb(i,j):
            b+=1

while a!=k or b!=k:
    if time.time()-start>1.9:
        break
    x1,y1=random.randint(0,h-1),random.randint(0,w-1)
    x2,y2=random.randint(0,h-1),random.randint(0,w-1)
    if abs(x1-x2)+abs(y1-y2)<=1:
        continue
    prea,preb=a,b
    for V in V5:
        if 0<=x1+V[0]<h and 0<=y1+V[1]<w:
          if cha(x1+V[0],y1+V[1]):
            a-=1
        if 0<=x1+V[0]<h and 0<=y1+V[1]<w:
          if chb(x1+V[0],y1+V[1]):
            b-=1
        if 0<=x2+V[0]<h and 0<=y2+V[1]<w:
          if cha(x2+V[0],y2+V[1]):
            a-=1
        if 0<=x2+V[0]<h and 0<=y2+V[1]<w:
          if chb(x2+V[0],y2+V[1]):
            b-=1
    X[x1][y1],X[x2][y2]=X[x2][y2],X[x1][y1]
    for V in V5:
        if 0<=x1+V[0]<h and 0<=y1+V[1]<w:
          if cha(x1+V[0],y1+V[1]):
            a+=1
        if 0<=x1+V[0]<h and 0<=y1+V[1]<w:
          if chb(x1+V[0],y1+V[1]):
            b+=1
        if 0<=x2+V[0]<h and 0<=y2+V[1]<w:
          if cha(x2+V[0],y2+V[1]):
            a+=1
        if 0<=x2+V[0]<h and 0<=y2+V[1]<w:
          if chb(x2+V[0],y2+V[1]):
            b+=1
    if abs(prea-k)+abs(preb-k)<abs(a-k)+abs(b-k):
        X[x1][y1],X[x2][y2]=X[x2][y2],X[x1][y1]
        a=prea
        b=preb            
            
if a==k and b==k:
    for I in X:
        print(*I)
    exit()
print(-1)