Can't Input Last Character; Program Ends Abruptly

[fundean]

import java.io.*;

public class Ascii {


public static void main(String[] args) {

TextReader UserInput = new TextReader(System.in);
System.out.println ("Please type the start character");
char startChar = UserInput.readChar();

System.out.println ("Please type the last character");
char lastChar = UserInput.readChar();

if (lastChar < startChar){
System.out.println ("Error, last character is before start character");
}

for (char ascii = startChar; ascii <= lastChar; ++ascii){

System.out.print (ascii);
}

} // end of main

} // end class


The output of the above code gives me the following:

Please type the start character
a
Please type the last character
Error, last character is before start character
Press any key to continue...

The program doesn't give me time to input the last character. Any suggestions?