import java.io.FileNotFoundException;

public class Main {
public static void main (String [] args) {
TschenrechnerScanner scanner;
try {
    scanner = new TschenrechnerScanner
    (new java.io.FileReader("test"));
} catch (FileNotFoundException e) {
    scanner = new TschenrechnerScanner(new java.io.StringReader("digga"));
}
TschenrechnerParser parser = new TschenrechnerParser() ;
try {
parser.yyparse(scanner);
}
catch (Exception e) {
e.printStackTrace();
}
}
}