Problem:
Swapping Two Numbers

Write a program which reads two integers x and y, and prints them in ascending order.

Input

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.

Output

For each dataset, print x and y in ascending order in a line. Put a single space between x and y.

Constraints

0 ≤ x, y ≤ 10000

the number of datasets ≤ 3000

Sample Input

3 2
2 2
5 3
0 0

Sample Output

2 3
2 2
3 5

Solution in JavaScript (judge verdict: Accepted)

function Main(input) {
  let args = input.trim().split("\n");

  let n = args.length;
  for (let i = 0; i < n; i++) {
    let tmp = args[i].split(" ").map((x) => parseInt(x, 10));
    let x = tmp[0];
    let y = tmp[1];
    if (x === 0 && y === 0) {
      break;
    }
    if (x > y) {
      // 分割代入による swap
      [x, y] = [y, x];
    }
    console.log(x, y);
  }
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));