题解

 #include<iostream>
#include<string>
using namespace std;
int main(){
	string s;
	getline(cin,s);
	int a=0,b=0,c=0;
	for(int i=0;i<=s.size()-2;i++){
		if(s[i]>='a' && s[i]<='z')
		a++;
		else if(s[i]>='0' && s[i]<='9')
		b++;
		else
		c++;
	}
	cout<<"Letters="<<a<<endl;
	cout<<"Digits="<<b<<endl;
	cout<<"Others="<<c<<endl;
	return 0;
}