/**
 *Converts string containing only upper case letters (bijective base-26 form) to
 *its equivalent decimal number
 *@param {string} input string containing only upper case letters
 *@returns {number} Decimal number conversion of bijective base-26 upper case
 *    letter input
 *@example bb26ToDecimal("AZ"); // output: 52
 */
export default function bb26ToDecimal(input: string): number;
/**
 * performs recursive operation
 *@param {string} input string containing only upper case letters
 *@param {number} sum summation variable default 0
 *@returns {number} returns decimal number conversion of bijective base-26 input
 */
export declare function rbb26ToDecimal(input: string, sum?: number): number;
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