JAVA: Write a program to print a histogram of the frequency of letters 'a' to 'z' found in the input. Treat upper case as lower case (e.g. include 'A' in the 'a' count). Ignore anything other than 'a'-'z' and 'A'-'Z'. Format the output like the histogram example done in class starting each row with the corresponding letter, a colon (":") then a row of asterisks ('*') corresponding to the frequency of that letter.

For example if the input was:

aabbbcab!& xyzzz eeeeee 

The output would be:

a:*** b:**** c:* d: e:****** f: g: h: i: j: k: l: m: n: o: p: q: r: s: t: u: v: w: x:* y:* z:***