'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;
  }(
    line.map(Number)
  ));
  console.log(result);
}

Main(require('fs').readFileSync('/dev/stdin', 'utf8'));