题解

#include<bits/stdc++.h>//万能头文件 
using namespace std;
int main(){
    string a;
    int l=0;
    int d=0;
    int o=0;
    int sum=0;
    
    getline(cin,a);
    for(int i=0;a[i]!='?';i++){
        if(a[i]>='a'&&a[i]<='z')
            l++;
        else if(a[i]>='0'&&a[i]<='9')
            d++;
        else
            o++;

    }
    //A的AscaII码65
	//a的AscaII码97 
	//0的AscaII码48 
	//空格的AscaII码32 
    cout<<"Letters="<<l<<endl;
    cout<<"Digits="<<d<<endl;
    cout<<"Others="<<o<<endl;
	return 0;
}