How many vowels are preceded by an even number and followed by an odd one?

Q. How many even numbers are there in the following series of numbers each of which is preceded by an odd number but not followed by an even number?
5 3 4 8 9 7 1 6 5 3 2 9 8 7 3 5

Q. How many odd numbers are there in the sequence which are immediately preceded and also Immediately followed by an even number?

Q. How many even numbers are there in the following. sequence of numbers which are immediately followed by an odd number as well as immediately preceded by an even number ?
86768932753422355228119

Q. How many even numbers are there in the following sequence of numbers which are immediately preceded by an odd number but immediately followed by an even number?
5 1 4 7 3 9 8 5 7 2 6 3 1 5 8 6 3 8 5 2 3 4 3 4 9 6

Q. How many even numbers are there in the following sequence of number, each of which is followed by an odd number as well as preceded by an even number?
$86768932753422355228119.$