给定一个文本输入，按照首字母顺序从a到z输出每个单词出现的次数。
"Apple is a fruit, which is good for your health, and it is also delicious. Banana is another fruit, which is easy to carry and eat, and it is rich in potassium."
a: 2
also: 1
and: 2
another: 1
apple: 1
banana: 1
carry: 1
delicious: 1
easy: 1
eat: 1
for: 1
fruit: 2
good: 1
health: 1
in: 1
is: 3
it: 2
k: 1
potassium: 1
rich: 1
to: 1
which: 2
your: 1