Английские буквы.java

package com.javarush.task.task18.task1816;

/* 
Английские буквы javarush
*/

import java.io.FileInputStream;
import java.io.IOException;

public class Solution {
    public static void main(String[] args) throws IOException {
        FileInputStream iStream = new FileInputStream(args[0]);
        byte[] array = new byte[iStream.available()];
        int counter = 0;
        iStream.read(array);
        for (byte element: array
             ) {
            if ((element>='a') & (element<='z') | (element>='A') & (element <='Z')) counter++;
        }
        iStream.close();
        System.out.println(counter);
    }
}