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import java.io.*;
import antlr.collections.AST;
class Main {
public static void main(String[] args) {
try {
ExprLexer lexer = new ExprLexer(new DataInputStream(System.in));
ExprParser parser = new ExprParser(lexer);
// set the type of tree node to create; this is default action
// so it is unnecessary to do it here, but demos capability.
parser.setASTNodeType("antlr.CommonAST");
parser.expr();
antlr.CommonAST ast = (antlr.CommonAST)parser.getAST();
if (ast != null) {
System.out.println(ast.toStringList());
} else {
System.out.println("null AST");
}
} catch(Exception e) {
System.err.println("exception: "+e);
}
}
}
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