public static String biggerIsGreater(String w) {
    int n = w.length();
    char[] c = w.toCharArray();
    
    StringBuilder sb = new StringBuilder();
    for (int i = n-2; i >= 0; i--) {
        for (int j = n-1; j > i; j--) {
            if (c[j] > c[i]) {
                sb.append(w.substring(0, i));
								
                sb.append(c[j]);
                
                String temp = w.substring(i, j) + w.substring(j+1);
                char[] c2 = temp.toCharArray();
                Arrays.sort(c2);
                
                sb.append(c2);
                
                return sb.toString();
            }
        }
    }
    
    return "no answer";
}