def calc(H,W):
  if H>W:
    ans=[]
    for x,y in calc(W,H):
      ans.append((y,x))
    return ans
  
  use1=set()
  use2=set()
  ans=[]
  for x in range(1,H+1):
    for y in [1,W]:
      if x+y not in use1 and x-y not in use2:
        ans.append((x,y))
        use1.add(x+y)
        use2.add(x-y)
  
  for y in range(1,W+1):
    for x in [(H+1)//2,(H+2)//2]:
      if x+y not in use1 and x-y not in use2:
        ans.append((x,y))
        use1.add(x+y)
        use2.add(x-y)
  return ans

H,W=map(int,input().split())
ans=calc(H,W)
print(len(ans))
for x,y in ans:
  print(x,y)