sand,t = map(int,input().split(" "))

if t >= sand:
  print(0)
  
else:
  print(sand - t)
84f9c37456ae75290d046c7a939d15a99e4b0ebd
<mask token>

<mask token>
if t >= sand:
    print(0)
else:
    print(sand - t)

sand, t = map(int, input().split(' '))
if t >= sand:
    print(0)
else:
    print(sand - t)

sand,t = map(int,input().split(" "))

if t >= sand:
  print(0)
  
else:
  print(sand - t)