ShellScript, [A-Z] match lowercase letters

ss-[A-Z]

#!/bin/bash
# https://unix.stackexchange.com/questions/92445/bash-script-check-if-a-variable-is-in-a-z

# Exampl1
echo -e "Enter a character: \c"
read value
# LC_ALL=C  or LANG=C
case $value in
    [a-z] )
        echo "$value => a to z" ;;
    [A-Z] )
        echo "$value => A to Z" ;;
    * )
        echo "Unknown input" ;;
esac