ห๊ะ

а?; э?

Expresses sudden puzzlement or surprise rather than usually asking someone to repeat.

А? Что?

Usually sounds softer and less startled when asking someone to repeat.

А? Что?

A softer, less startled way to signal that something was not heard.

Что вы сказали?

Explicitly asks what was said and is usually less abrupt than a bare ห๊ะ.

а?; э?

Expresses puzzled surprise or sudden doubt rather than a startled request to repeat something.

э; а; хм

A softer, often drawn-out expression of surprise or puzzlement.