import sys
readline=sys.stdin.readline
w,h,n=map(int,readline().split())
s1=[[0]*w for i in range(h)]
s2=[[0]*h for i in range(w)]
for i in range(n):
 m=int(readline())
 b=list(map(int,readline().split()))
 for j in range(m):
  x1,y1=divmod(b[j],w)
  x2,y2=divmod(b[j+1],w)
  if x1==x2:
   if y1>y2:y1,y2=y2,y1
   s1[x1][y1]+=1
   s1[x1][y2]-=1
  else:
   if x1>x2:x1,x2=x2,x1
   s2[y1][x1]+=1
   s2[y1][x2]-=1
from itertools import accumulate
for i in range(h):s1[i]=list(accumulate(s1[i]))
for i in range(w):s2[i]=list(accumulate(s2[i]))
INF=9**9
d=[INF]*h*w
d[0]=0
que=[0]
for p in que:
 x, y=divmod(p, w)
 d0=d[p]
 p1,p2,p3,p4=(x-1)*w+y,(x+1)*w+y,x*w+y-1,x*w+y+1
 if x-1>=0and s2[y][x-1]and d[p1]>d0+1:
  d[p1]=d0+1
  que.append(p1)
 if x+1<h and s2[y][x]and d[p2]>d0+1:
  d[p2]=d0+1
  que.append(p2)
 if y-1>=0and s1[x][y-1]and d[p3]>d0+1:
  d[p3]=d0+1
  que.append(p3)
 if y+1<w and s1[x][y]and d[p4]>d0+1:
  d[p4]=d0+1
  que.append(p4)
print(d[-1]if d[-1]<INF else"Odekakedekinai..")