public class Exam01{
    public static void main(String[] args) {
        for(int i = 0; ; i++){
            if(i == 0){
                System.out.println("(0, 0)");
            }
            for(int j = i; j > -i; j--){
                if(j > 0){
                    int k = i - j;
                    System.out.println("(" + j + ", " + k + ")");
                }
                else{
                    int k = i + j;
                    System.out.println("(" + j + ", " + k + ")");
                }
            }
            for(int j = i; j > -i; j--){
                if(j > 0){
                    int k = i - j;
                    System.out.println("(" + -j + ", " + -k + ")");
                }
                else{
                    int k = i + j;
                    System.out.println("(" + -j + ", " + -k + ")");
                }
            }
        }
    }
}