Не проходит валидацию
package com.javarush.task.task18.task1816;
/*
Английские буквы
*/
import java.io.FileInputStream;
import java.io.IOException;
public class Solution {
public static void main(String[] args) throws IOException {
FileInputStream stream = new FileInputStream(args[0]);
int count = 0;
while(stream.available() > 0){
int data = stream.read();
if (Character.isLetter((Character.toString((char)data).charAt(0)) ))
count++;
}
stream.close();
System.out.println(count);
}
}