import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
class Main {
public static String readStringFromStream(InputStream stream) throws IOException {
InputStreamReader isReader = new InputStreamReader(stream, Charset.forName("utf-8"));
BufferedReader br = new BufferedReader(isReader);
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line).append("\n");
}
return sb.toString();
}
}