How do I return a char array corresponding to LETTERS in java?

If the argument is null, the length is anything other than 6, or if the element values are outside the inclusive bound of 1 to 7 throw the IllegalArgumentException with the message "Invalid parameter". Otherwise return a char array that has input[0] instances of 'Q', followed by input[1] instance of 'W', ....followed by input[5] instances of 'Y'. The length of the returned array should be the exact size needed to accommodate all the letters (no smaller or larger)

This is what I have so far:

public static char[] QWERTY (int [] input) {

    if((input == null) || (input.length > 6))
    {
        throw new IllegalArgumentException("Invalid parameter");
    }
    else
        
    return null;  
}

I just need the else condition