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class Solution {
    public String solution(String s) {
        String newStr = s.replaceAll("\\s+", " ");

        String[] s_split = newStr.split(" ");
        String answer = "";

        for (String str : s_split) {
            String[] str_split = str.split("");

            if (isInteger(str_split[0])){
                answer += (str.toLowerCase() + " ");

            } else {
                answer += (str.substring(0, 1).toUpperCase() + str.substring(1).toLowerCase() + " ");
            }
        }

        return answer.trim();
    }

    public static boolean isInteger(String strValue) {
        try {
            Integer.parseInt(strValue);
            return true;
        } catch (NumberFormatException ex) {
            return false;
        }
    }
}