new_contents: import sys
  import math
  
  # Auto-generated code below aims at helping you parse
  # the standard input according to the problem statement.
  
  numbers = [int(x) for x in input().split()]
  u = 0
  d = 0
  for x in numbers:
      if x >= 0:
          u += 1
      else:
          d += 1
  if u == 1:
      for x in numbers:
          if x >= 0:
              print(x)
  else:
      for x in numbers:
          if x < 0:
              print(x)
  
  # Write an action using print
  # To debug: print("Debug messages...", file=sys.stderr)
  
  
  
subject: Create intNotLikeOthers.py