fixed script 3

Author: M-Abdoon

shell-pipelines/ls-grep/script-03.sh

@@ -4,4 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command to output the names of the files in the sample-files directory whose name starts with an upper case letter and doesn't contain any other upper case letters.
 # Your output should contain 7 files.
-ls sample-files | grep '^[A-Z][a-z]*$'
+ls sample-files | grep '^[A-Z][^A-Z]*$'