Почему не проходит?
package com.javarush.task.task19.task1909;
import java.io.*;
public class Solution {
public static void main(String[] args) throws IOException{
BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
BufferedReader inp = new BufferedReader(new FileReader(buf.readLine()));
BufferedWriter out = new BufferedWriter(new FileWriter(buf.readLine()));
buf.close();
int s=inp.read();
while (s!=-1){
switch (s){
case '.':
s='!';
break;
}out.write(s);
s=inp.read();
}
inp.close();
out.close();
}
}