import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int[] a = new int[10000];
				for(int i = 0 ; i<10000 ; i++){
					a[i]=scan.nextInt();
					if(a[i]==0) break;
					}
				
		for(int i = 0 ; i<10000 ; i++){
			if(a[i]==0) break;
		System.out.println("Case "+(i+1)+": "+a[i]);
		}
	}


}
/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