/**
 * Decreases a bijective base-26 number by 1
 * @param input {string} string containing only uppercase letters
 * @returns {string} Bijective base-26 input - 1
 * @Example bb26Decrement("B") //"A"
 * @Example bb26Decrement("AA") //"Z"
 */
export default function bb26Decrement(input: string): string;
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