output_description: Print the number of sand in the upper bulb after t second.
  
  * * *
input_description: The input is given from Standard Input in the following format:
  
      
      
      X t
attempt: from collections import Counter, defaultdict, deque
  from heapq import heappop, heappush, heapify
  import sys, bisect, math, itertools, fractions
  
  sys.setrecursionlimit(10**8)
  mod = 10**9 + 7
  INF = float("inf")
  
  
  def inp():
      return int(sys.stdin.readline())
  
  
  def inpl():
      return list(map(int, sys.stdin.readline().split()))
  
  
  x, t = inpl()
  print(max(x - t, 0))
  
problem_description: Statement
  
  We have a sandglass that runs for X seconds. The sand drops from the upper
  bulb at a rate of 1 gram per second. That is, the upper bulb initially
  contains X grams of sand.
  
  How many grams of sand will the upper bulb contains after t seconds?
samples: [{"input": "100 17", "output": "83\n    \n\n17 out of the initial 100 grams of sand will be consumed, resulting in 83\ngrams.\n\n* * *"}, {"input": "48 58", "output": "0\n    \n\nAll 48 grams of sand will be gone, resulting in 0 grams.\n\n* * *"}, {"input": "1000000000 1000000000", "output": "0"}]