05AB1E, 4 3 2 bytes (non-competing)

_{Crossed out 4 is still regular 4 ;(}

Thanks to @Adnan for a byte.

žt

Uses CP-1252 encoding.

Explanation:

žt - Push input. Pop a, push e to a places (up to 10000).

Update:

Remove I, as žt takes input anyway if none is on the stack.

05AB1E, 4 3 2 bytes

_{Crossed out 4 is still regular 4 ;(}

Thanks to @Adnan for a byte.

žt

Uses CP-1252 encoding.

Explanation:

žt - Push input. Pop a, push e to a places (up to 10000).

Update:

Remove I, as žt takes input anyway if none is on the stack.

05AB1E, 4 3 2 bytes (non-competing)

_{Crossed out 4 is still regular 4 ;(}

Thanks to @Adnan for a byte.

žt

Uses CP-1252 encoding.

Explanation:

žt - Push input. Pop a, push e to a places (up to 10000).

Update:

Remove I, as žt takes input anyway if none is on the stack.

05AB1E, 4 3 2 bytes (non-competing)

_{Crossed out 4 is still regular 4 ;(}

Thanks to @Adnan for a byte.

žt

Uses CP-1252 encoding.

Explanation:

žt - Push input. Pop a, push e to a places (up to 10000).

Update:

Remove I, as žt takes input anyway if none is on the stack.

05AB1E, 4 3 2 bytes (non-competing)

_{Crossed out 4 is still regular 4 ;(}

Thanks to @Adnan for a byte.

žt

Explanation:

žt - Push input. Pop a, push e to a places (up to 10000).

Update:

Remove I, as žt takes input anyway if none is on the stack.

05AB1E, 4 3 2 bytes (non-competing)

_{Crossed out 4 is still regular 4 ;(}

Thanks to @Adnan for a byte.

žt

Uses CP-1252 encoding.

Explanation:

žt - Push input. Pop a, push e to a places (up to 10000).

Update:

Remove I, as žt takes input anyway if none is on the stack.