题解

#include<iostream>
using namespace std;
string s;
int a,b,c;
int main(){
    getline(cin,s);
    for(int i=0;s[i]!='?';i++){
        if(s[i]>='a' && s[i]<='z'){
            a++;
        }
        else if(s[i]>='0' && s[i]<='9'){
            b++;
        }
        else{
            c++;
        }
    }
    cout<<"Letters="<<a<<endl
        <<"Digits="<<b<<endl
        <<"Others="<<c<<endl;
}