#include<iostream>
#include<string.h>
using namespace std;
string a;
int main()
{
	getline(cin,a);
	int ans=0;
	for(int i=0;i<a.size();i++)
	{
		if(a[i]!=' ') ans++;
	}
	cout<<ans;
	return 0;
}

python3的好处：可以半中文编程

作文标题=input()
字符数=0
for 字符 in 作文标题:
    if 字符!=' ' and 字符!='\n':
        字符数+=1
print(字符数)

#include <iostream>
#include <string>
using namespace std;
int main(){
    string a;
    int sum = 0;
    getline(cin,a);
    for(int i = 0;i <= a.length();i++){
        if(a[i] >= 'a' and a[i] <= 'z'){
            sum += 1;
        }
        else if(a[i] >= 'A' and a[i] <= 'Z'){
            sum += 1;
        }
        else if(a[i] >= '0' and a[i] <= '9'){
            sum += 1;
        }
    }
    cout << sum;
    return 0;
}