题解

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