Program That Counts Number Of Individual Letters In A File

What my program needs to do:

1) accepts a filename from the user that indicates the input file
2)obtains a filename to use as the output file
3)the program then reads the file and reports how many of each letter are there in the file.
4)if the file could not be opened, you must ask the user for valid file name until one is given
5)once a valid file name is given, print all of contents and store the analysis of the file in the output file name specified

You will be reading the input from a file and printing the output to another file. For example, if the file input.txt contains:

This file contains lett3rs.
YoU counT Only lEtTers, not numb3rs.
How many h's are in "Ohhhhhhhhhhh no!"?

The program should ignore white spaces, new lines and other special characters or numbers. It should count only the letters (a-z and/or A-Z) in the input file.

An example execution might look like this:

Input a file name: notAFile.txt
Invalid filename given. Input another.
Input a file name: alsoNotAFile.txt
Invalid filename given. Input another.
Input a file name: input.txt

[Code] ....

1)The last try/catch block was given by my professor, however the only thing it does is print out "hello java" into an out file. How would I make it print out similar to that of the given example?

2)I figured out how to make the array print out ABCDEFG... etc...how to count the amount of them.