import java.util.Scanner;

public class zad6 {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        int k=Integer.parseInt(scanner.nextLine());
        int l=Integer.parseInt(scanner.nextLine());
        int m=Integer.parseInt(scanner.nextLine());
        int n=Integer.parseInt(scanner.nextLine());
        int count=0;
        for(int i=k;i<=8;i++){
            if(count==6){
                break;
            }
            for (int j = 9; j>=l ; j--) {
                if(count==6){
                    break;
                }
                for (int o = m; o <=8 ; o++) {
                    if(count==6){
                        break;
                    }
                    for (int p = 9; p >=n ; p--) {
                        if(count==6){
                            break;
                        }
                        if(i%2==0&&o%2==0&&j%2==1&&p%2==1){
                            if(i==o&&j==p){
                                System.out.print("Cannot change the same player.\n");
                            }   else {
                                count++;
                                System.out.printf("%d%d - %d%d\n", i, j, o, p);
                            }
                        }
                    }
                }
            }



        }


    }
}