题解

#include <bits/stdc++.h>
using namespace std;
string n;
int cnt1=0,cnt2=0,cnt3=0;
int main()
{
	getline(cin,n);
	int len=n.size();
	for(int i=0;i<=len-1;i++)
	{
		if(n[i]>='a' and n[i]<='z') cnt1++;
		else if(n[i]>='A' and n[i]<='Z') cnt1++;
		else if(n[i]>='0' and n[i]<='9') cnt2++;
		else if(n[i]!='?') cnt3++;
	}
	cout<<"Letters="<<cnt1<<endl;
	cout<<"Digits="<<cnt2<<endl;
	cout<<"Others="<<cnt3<<endl;	
	return 0;
}