After passing a string parameter for removeLetter() method, how can I return the same string with a single letter removed?

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Java

I'm trying to pass strings for removeLetter() method, and return the the string with a single letter removed. After I have created a single random character in the end, how can I remove the single random character from the strings I have passed in 's1' and 's2'?

Maybe something like this:

String newWord = letters.charAt() - letters.charAt(charPos);

Full code:

public class MyProgram
{
    public void start()
    {
        String s1 = removeLetter("MARVELLOUS");
        String s2 = removeLetter("TANGO");

        System.out.println("Letters removed: " + s1 + ", " + s2);
    }

    private String removeLetter(String letters)
    {

        int li = az.length();
        int ranChar = (int)(Math.random()*li);
        char charPos = letters.charAt(ranChar);


    }
}