import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class Main {

	public static void main(String[] args) throws IOException{
		int a = 0;
		int n = 10000; //?????§????????????????????°
		int j = 0;
		ArrayList<Integer> parse = new ArrayList<Integer>(); // int??????
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		while(j != n){
			a = Integer.parseInt(br.readLine());
			if(a == 0){
				break;
			}
			parse.add(a);
			++j;
		}

		for(int i = 1; i <= parse.size(); ++i){
		System.out.println("Case " + (i) + ": " + parse.get(i-1));
		}
	}
}
/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