def myabs(a):
   return a if a >= 0 else -a


def myabs1(a):
   if a >= 0:
      return a
   else:
      return -a


print(myabs(-17))
print(myabs(63))
print(myabs(0))

print(myabs1(-17))
print(myabs1(63))
print(myabs1(0))