题解

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int a=0,b=0,c=0;
    string s;
    getline(cin,s);
    for (int i=0;i<s.size();i++)
    {
        if (s[i]>='a' && s[i]<='z')
            a++;
        else if (s[i]>='A' && s[i]<='Z')
            a++;
        else if (s[i]>='0' && s[i]<='9')
            b++;
        else if (s[i]!='?')
            c++;
    }
    cout << "Letters=" << a << endl;
    cout << "Digits=" << b << endl;
    cout << "Others=" << c;
    return 0;
}