tj

#include <bits/stdc++.h>//万能头
using namespace std;//命名空间

string str;//定义这个字符串
long long count_letters , count_digits , count_others;
/*
count_letters:字母统计变量
count_digits:数字统计变量
count_others:其他字符统计变量
*/

int main() {//主函数
    getline(cin , str);//因为输入包含空格，所以使用getline

    for (int i = 0 ; i < str.length() ; i++) {//遍历字符串
        if (str[i] != '?') {//首先先保证下标i是？
            //18~21统计个数
            if (str[i] >= 'a' && str[i] <= 'z') {
                count_letters++;
            }else if (str[i] >= '0' && str[i] <= '9') {
                count_digits++;
            }else {
                count_others++;
            }
        }
        
    }
    //27~30输出个数
    cout << "Letters=" << count_letters << endl;
    cout << "Digits=" << count_digits << endl;
    cout << "Others=" << count_others << endl;
    return 0;
}