n=int(input())
b=[500*[0]for _ in range(500)]
xy=[list(map(lambda x:int(x)-1,input().split()))for _ in range(n)]
for i in range(n):
  x,y=xy[i]
  xy[i]=((x**2+y**2)**0.5,x,y,i)
xy.sort()
ans=[]
dxx=[1,0,-1,0]
dyy=[0,1,0,-1]
dxy=zip(dxx,dyy)
for _,sx,sy,i in xy:
  if b[sx][sy]:continue
  ans.append(i+1)
  stack=[(sx,sy)]
  for x,y in stack:
    b[x][y]=1
    for dx,dy in zip(dxx,dyy):
      if ((sx-(x+dx))**2+(sy-(y+dy))**2)**0.5>10:continue
      if not(0<=x+dx<500):continue
      if not(0<=y+dy<500):continue
      if b[x+dx][y+dy]:continue
      stack.append((x+dx,y+dy))
print(len(ans))
print(*ans)