code: function abecidianToColumnNumber(code) {
  	var column = 0;
  	for (var c = 0; c < code.length; c += 1) {
  		var letter = code[code.length - 1 - c];
  		var value = letter.charCodeAt(0) - 64;
  		column += value * Math.pow(26, c);
  	}
  	return column;
  }
docs: input: AB output: 27