import type.lang.*;

public class Substitute
{
	public static void main(String[] args)
	{
		// Given a string of [A-F] letters, replace them 
		// by digits [0-5], respectively (see text, p. 159)
		final String GRADES = "ABCDEF";
		final String POINTS = "543210";

		IO.print("Enter the string to map:");
		String s = IO.readLine();

		for (int idx = 0; idx < s.length(); ++idx)
		{
			int position = GRADES.indexOf(s.charAt(idx));
			char nu = POINTS.charAt(position);
			s = s.substring(0, idx) + nu + s.substring(idx + 1);
		}

		IO.println("New string = " + s);
	}
}