output_description: For each dataset, print x and y in ascending order in a line. Put a single
  space between x and y.
input_description: The input consists of multiple datasets. Each dataset consists of two integers
  x and y separated by a single space.
  
  The input ends with two 0 (when both x and y are zero). Your program should
  not process for these terminal symbols.
attempt: n = []
  line = ""
  while line != [0, 0]:
      line = list(map(int, input().split()))
      n.append(line)
  for i in range(len(n) - 1):
      print(
          "%d %d"
          % (
              n[i][0] if n[i][0] >= n[i][1] else n[i][1],
              n[i][0] if n[i][0] <= n[i][1] else n[i][1],
          )
      )
  
problem_description: Swapping Two Numbers
  
  Write a program which reads two integers x and y, and prints them in ascending
  order.
samples: [{"input": "2\n    2 2\n    5 3\n    0 0", "output": "3\n    2 2\n    3 5"}]