class Solution {
public:
    bool detectCapitalUse(string word) {
        int big = 0, small = 0, len = word.length();
        for (int i = 0; i < len; i++) {
            if (word[i] >= 65 && word[i] <= 90) {
                big++;
            }
            else {
                small++;
            }
        }
        if (big == len || small == len) {
            return true;
        }
        else if (len > 1 && big == 1) {
            if (word[0] <= 90) {
                return true;
            }
            else {
                return false;
            }
        }
        else {
            return false;
        }
    }
};