public static void main(String[] args) {
        String  s= "U18A1组";
        char[] chars = s.toCharArray();
        for (int i = chars.length-1; i >=0 ; i--) {
            if ((chars[i]+"").getBytes().length==1 && 'A'<=chars[i]&&chars[i]<='Z'){
                System.out.println(chars[i]);
                break;
            }
        }
}

 

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