import java.util.*;
import java.lang.*;
import java.text.Normalizer;
import java.nio.charset.*;
import java.io.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(convertTo7BitAsciiWithCodepointNames("Hello \uD83D\uDE00 \uD835\uDC2E frappé, naïve, soufflé"));
	}
 
    public static String convertTo7BitAsciiWithCodepointNames(String input) {
    	// Normalize to replace as much as possible with normal character forms
    	input = Normalizer.normalize(input, Normalizer.Form.NFKD);
 
    	// Then substitute as required into the target charset
        CharsetEncoder encoder = StandardCharsets.ISO_8859_1.newEncoder();
        StringBuilder resultBuilder = new StringBuilder();
 
        // Iterate through the string by codepoint
        for (int i = 0; i < input.length(); ) {
            int codePoint = input.codePointAt(i);
 
            String utf16chars = Character.toString(codePoint);
            if (Character.getType(codePoint) == Character.NON_SPACING_MARK) {
            	// ignore combining accent characters
        	} else if (encoder.canEncode(utf16chars)) {
                resultBuilder.append(utf16chars);
            } else {
                // Character is NOT encodable, replace with its Unicode codepoint name
                resultBuilder.append('[');
                resultBuilder.append(Character.getName(codePoint));
                resultBuilder.append(']');
            }
 
            i += utf16chars.length();
        }
        return resultBuilder.toString();
    }
}

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