SRE_Test.sh

#!/bin/bash
declare -A Count
echo "hit CTRL-C to stop"
echo "enter value of n"
read N
while [ 1 ] 
do
  
  read input

  for word in $input
  do
    if  [[ "$word" =~ ^[[:alnum:]]*$ ]] && [ ${#word} > N ]

   	 then  $Count["${word,,}"] += 1
   fi
  done

 for i in "${!Count[@]}"
  do
  	echo "hello"
  echo "$i  : ${Count[$i]}"
  done

 # if $? -gt 128 
 # then
 #  echo "exit"
 #  break
 # fi

done