#!/bin/bash
S="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
function inc
{
    local I F B
    F=${1%?}
    B=${1#$F}

    case "$B" in
       (\ ) echo "$(inc "$F") " ;;
       (Z) [ -z "$F" ] && echo AA || echo "$(inc "$F")A" ;;
       (*) echo "$F${S:1+36#$B:1}"
    esac
}

read -p "Source : " src
read -p "Increment Number : " cnt

for((i=0;i<cnt;i++)) {
    echo "$src"
    src=$(inc "$src")
}