(function() {
    'use strict';

    var fs = require('fs');
    var contents = fs.readFileSync('/dev/stdin', 'utf-8');

    var printTest = function(contents) {
        var a = contents.trim().split("\n");
        for (var i = 0; i < a.length; i++) {
            var n = parseInt(a[i]);
            if (n === 0) {
                break;
            }
            console.log("Case " + (i + 1) + ": " + n);
        }
    }

    printTest(contents);
})();