def first$\_$vowel$($s$)$:

$"""$

Returns the position of the first vowel in s; it returns $-1$ if there are no vowels.

We define the vowels to be the letters $\text{'}$a$\text{'},\text{'}$e$\text{'},\text{'}$i$\text{'},\text{'}$o$\text{'},$ and $\text{'}$u$\text{'}.$ The letter

$\text{'}$y$\text{'}$ counts as a vowel only if it is not the first letter in the string.

Examples:

first$\_$vowel$(\text{'}$hat$\text{'})$ returns $1$

first$\_$vowel$(\text{'}$grrm$\text{'})$ returns $-1$

first$\_$vowel$(\text{'}$sky$\text{'})$ returns $2$

first$\_$vowel$(\text{'}$year$\text{'})$ returns $1$

Parameter s: the string to search

Precondition: s is a nonempty string with only lowercase letters

$"""$

pass

def pigify$($s$)$:

$"""$

Returns a copy of s converted to Pig Latin

Pig Latin is childish encoding of English that adheres to the following rules:

$1.$ The vowels are $\text{'}$a$\text{'},\text{'}$e$\text{'},\text{'}$i$\text{'},\text{'}$o$\text{'},\text{'}$u$\text{'},$ as well as any $\text{'}$y$\text{'}$

that is not the first letter of a word. All other letters are consonants.

For example, 'yearly' has three vowels $(\text{'}$e$\text{'},\text{'}$a$\text{'},$ and the last $\text{'}$y$\text{'})$

and three consonants $($the first $\text{'}$y$\text{'},\text{'}$r$\text{'},$ and $\text{'}$l$\text{'}).$

$2.$ If the English word begins with a vowel, append 'hay' to the end of the word

to get the Pig Latin equivalent. For example, 'ask 'askhay' and 'use' becomes

'usehay'.

$3.$ If the English word starts with $\text{'}$q$\text{'},$ then it must be followed by'u'; move

$\text{'}$qu$\text{'}$ to the end of the word, and append $\text{'}$ay$\text{'}.$ Hence 'quiet' becomes

'ietquay' and 'quay' becomes 'ayquay'.

$4.$ If the English word begins with a consonant, move all the consonants up to

the first vowel $($if any$)$ to the end and add $\text{'}$ay$\text{'}.$ For example, 'tomato'

becomes 'omatotay', 'school' becomes 'oolschay'. 'you' becomes 'ouyay' and

$\text{'}$ssssh$\text{'}$ becomes 'sssshay'.

Parameter s: the string to change to Pig Latin

Precondition: s is a nonempty string with only lowercase letters. If s starts with

$\text{'}$q$\text{'},$ then it starts with $\text{'}$qu$\text{'}.$

$"""$