How to do when loading a page put focus on an input and cursor stay after value that is inside the input?

Question

When loading a page I am focusing on an input, but it puts the cursor always to the extreme left, like to put the focus and the cursor was after the text inside the input and not before as you are doing

I managed to get him to focus on the input but he puts the focus before the text that comes along with input

<script>
document.nomeformulario.nomecampo.focus();
</script>
<form name='nomeformulario' action='pagina' method='POST'>
<input name='nomecampo' type='text' value'5'>
<button type='submit'>enviar</button>
</form>

in the code I typed it puts the focus on the input and the cursor before the 5 would like you to put the focus on the input and the cursor after the 5

The left what happens To right what I want