...
package com.javarush.task.task18.task1816;
import java.io.*;
import java.util.ArrayList;
public class Solution {
public static void main(String[] args)throws IOException {
FileInputStream inp = new FileInputStream(args[0]);
ArrayList<String> list = new ArrayList();
int i = 0;
while(inp.available()>0){
list.add(Integer.toString(inp.read()));
}
inp.close();
for(String s:list){
if(s.matches("[a-z]")||s.matches("[A-Z]")){
i++;
}
}
System.out.print(i);
}
}