#!/bin/bash

read -p "26-long sequence?" input

declare -A results
steps=(3 5 7 9 11)

for step in "${steps[@]}"; do
   decimated=""
   length=${#input}
   index=0

   while [ ${#decimated} -lt 26 ]; do
       char="${input:index:1}"

       if [[ ! "$decimated" =~ "$char" ]]; then
           decimated+="$char"
       fi

       index=$((index + step))

       if [ $index -ge $length ]; then
           index=$((index - length))
       fi
   done

   results["$step"]="$decimated"
done

echo "Original string: $input"
for step in "${steps[@]}"; do
   formatted_decimated=$(echo "${results[$step]}")
   echo -e ":: $formatted_decimated | ($step)"
done

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