import java.util.Scanner;

class Main{
	static public void main(String args[]){
		Scanner sc = new Scanner(System.in);
		/*StringBuilder:??????????????????????????±?????????*/
		StringBuilder sb = new StringBuilder();
		int idx = 0;
		int i = 0;

		while(true){
			idx = sc.nextInt();
			if(idx == 0)
				break;
			i++;
			/*append:????????????????????????*/
			sb.append("Case " + i + ":" + " " + idx + "\n");
		}
		System.out.print(sb);
	}
}
/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