'use strict';
function Main(stdin) {
  var line = stdin.split('\n');
  var result = (function(data) {
    var tmp = [];
    var index = 0;
        while (data[index] !== 0) {
            tmp.push('Case ' + (index + 1) + ': ' + data[index++]);
        }
    return tmp.join('\n');
  }(
    line.map(Number)
  ));
  console.log(result);
}
 
Main(require('fs').readFileSync('/dev/stdin', 'utf8'));