import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		
		Scanner stdIn = new Scanner(System.in);

		for (int i = 1; ;i++) {
			int x  = stdIn.nextInt();
			
			if (x == 0) break;
			
			System.out.println("Case " + i + ": " + x);
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		
		Scanner stdIn = new Scanner(System.in);

		for (int i = 1; ;i++) {
			int x  = stdIn.nextInt();
			
			if (x == 0) break;
			
			System.out.println("Case " + i + ": " + x);
		}
	}
} Main public static void main(String[] args) {
		
		Scanner stdIn = new Scanner(System.in);

		for (int i = 1; ;i++) {
			int x  = stdIn.nextInt();
			
			if (x == 0) break;
			
			System.out.println("Case " + i + ": " + x);
		}
	} main {
		
		Scanner stdIn = new Scanner(System.in);

		for (int i = 1; ;i++) {
			int x  = stdIn.nextInt();
			
			if (x == 0) break;
			
			System.out.println("Case " + i + ": " + x);
		}
	} Scanner stdIn = new Scanner(System.in); stdIn new Scanner(System.in) for (int i = 1; ;i++) {
			int x  = stdIn.nextInt();
			
			if (x == 0) break;
			
			System.out.println("Case " + i + ": " + x);
		} int i = 1; int i = 1; i 1 i++ i++ i {
			int x  = stdIn.nextInt();
			
			if (x == 0) break;
			
			System.out.println("Case " + i + ": " + x);
		} {
			int x  = stdIn.nextInt();
			
			if (x == 0) break;
			
			System.out.println("Case " + i + ": " + x);
		} int x  = stdIn.nextInt(); x stdIn.nextInt() stdIn.nextInt stdIn if (x == 0) break; x == 0 x 0 break; System.out.println("Case " + i + ": " + x) System.out.println System.out System System.out "Case " + i + ": " + x ": " "Case " + i + ": " + x "Case " i ": " x String[] args args public class Main {

	public static void main(String[] args) {
		
		Scanner stdIn = new Scanner(System.in);

		for (int i = 1; ;i++) {
			int x  = stdIn.nextInt();
			
			if (x == 0) break;
			
			System.out.println("Case " + i + ": " + x);
		}
	}
} public class Main {

	public static void main(String[] args) {
		
		Scanner stdIn = new Scanner(System.in);

		for (int i = 1; ;i++) {
			int x  = stdIn.nextInt();
			
			if (x == 0) break;
			
			System.out.println("Case " + i + ": " + x);
		}
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		
		Scanner stdIn = new Scanner(System.in);

		for (int i = 1; ;i++) {
			int x  = stdIn.nextInt();
			
			if (x == 0) break;
			
			System.out.println("Case " + i + ": " + x);
		}
	}
}
