How to change all file permissions to 644 and all folder permissions to 755

How to change all file permissions to 644 and all folder permissions to 755 recursively using chmod in the following two situation:

If they had 777 permissions

find . -type d -perm 777 -exec chmod 755 {} \; (for changing the directory permission)

find . -type f -perm 777 -exec chmod 644 {} \; (for changing the file permission)

If they did not have 777 permissions, we easily remove the -perm 777 part.

look like that

find . -type d -exec chmod 755 {} \; (for changing the directory permission)

find . -type f -exec chmod 644 {} \; (for changing the file permission)