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sed 's,.*,\L&,; s,.,\u&,; s,[ 0-9][^ ],\U&,g' file
       ^          ^              ^
...
       |          |              Capitalise any non-space char after a
+ space or a numeric
       |          Uppercase the first char
       Lower case the whole name

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```
echo "
FIRST
...
Seconf Thrid
Run4Life
```