import java.util.Scanner;

public class Main{
	public static void main(String args[]){

		
		Scanner sc = new Scanner(System.in);
		int intX = -1;
		int i = 0;

		while(intX != 0){
			intX = sc.nextInt();

			if(intX == 0 ){
				break;
			}

			i++;

			System.out.println("Case " + i + ": " + intX);
		}
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz