题解

#include<bits/stdc++.h>
using namespace std;
int ans;
string s;
int main()
{
	getline(cin,s);
	for(int i=0;i<s.size();i++)
	{
		if(s[i]>='A'&&s[i]<='Z')
			ans++;
		if(s[i]>='a'&&s[i]<='z')
			ans++;
		if(s[i]>='0'&&s[i]<='9')
			ans++;
	}
	cout<<ans;
	return 0;
}