import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();

		for(;;) {
			String num = br.readLine();
			String[] set = num.split(" ");

			int a = Integer.parseInt(set[0]);
			int b = Integer.parseInt(set[1]);

			if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			}
		}

		System.out.print(sb);

	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();

		for(;;) {
			String num = br.readLine();
			String[] set = num.split(" ");

			int a = Integer.parseInt(set[0]);
			int b = Integer.parseInt(set[1]);

			if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			}
		}

		System.out.print(sb);

	}
} Main public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();

		for(;;) {
			String num = br.readLine();
			String[] set = num.split(" ");

			int a = Integer.parseInt(set[0]);
			int b = Integer.parseInt(set[1]);

			if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			}
		}

		System.out.print(sb);

	} main {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();

		for(;;) {
			String num = br.readLine();
			String[] set = num.split(" ");

			int a = Integer.parseInt(set[0]);
			int b = Integer.parseInt(set[1]);

			if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			}
		}

		System.out.print(sb);

	} BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) StringBuilder sb = new StringBuilder(); sb new StringBuilder() for(;;) {
			String num = br.readLine();
			String[] set = num.split(" ");

			int a = Integer.parseInt(set[0]);
			int b = Integer.parseInt(set[1]);

			if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			}
		} ; {
			String num = br.readLine();
			String[] set = num.split(" ");

			int a = Integer.parseInt(set[0]);
			int b = Integer.parseInt(set[1]);

			if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			}
		} {
			String num = br.readLine();
			String[] set = num.split(" ");

			int a = Integer.parseInt(set[0]);
			int b = Integer.parseInt(set[1]);

			if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			}
		} String num = br.readLine(); num br.readLine() br.readLine br String[] set = num.split(" "); set num.split(" ") num.split num " " int a = Integer.parseInt(set[0]); a Integer.parseInt(set[0]) Integer.parseInt Integer set[0] set 0 int b = Integer.parseInt(set[1]); b Integer.parseInt(set[1]) Integer.parseInt Integer set[1] set 1 if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			} a == 0 && b == 0 a == 0 a 0 b == 0 b 0 {
				break;
			} break; if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			} a > b a b {
			sb.append(b).append(" ").append(a).append("\n");
			} sb.append(b).append(" ").append(a).append("\n") sb.append(b).append(" ").append(a).append sb.append(b).append(" ").append(a) sb.append(b).append(" ").append sb.append(b).append(" ") sb.append(b).append sb.append(b) sb.append sb b " " a "\n" {
			sb.append(a).append(" ").append(b).append("\n");
			} sb.append(a).append(" ").append(b).append("\n") sb.append(a).append(" ").append(b).append sb.append(a).append(" ").append(b) sb.append(a).append(" ").append sb.append(a).append(" ") sb.append(a).append sb.append(a) sb.append sb a " " b "\n" System.out.print(sb) System.out.print System.out System System.out sb String[] args args public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();

		for(;;) {
			String num = br.readLine();
			String[] set = num.split(" ");

			int a = Integer.parseInt(set[0]);
			int b = Integer.parseInt(set[1]);

			if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			}
		}

		System.out.print(sb);

	}
} public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();

		for(;;) {
			String num = br.readLine();
			String[] set = num.split(" ");

			int a = Integer.parseInt(set[0]);
			int b = Integer.parseInt(set[1]);

			if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			}
		}

		System.out.print(sb);

	}
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();

		for(;;) {
			String num = br.readLine();
			String[] set = num.split(" ");

			int a = Integer.parseInt(set[0]);
			int b = Integer.parseInt(set[1]);

			if (a == 0 && b == 0) {
				break;
			} else if (a > b) {
			sb.append(b).append(" ").append(a).append("\n");
			} else {
			sb.append(a).append(" ").append(b).append("\n");
			}
		}

		System.out.print(sb);

	}
}