#include <cctype>
#include <iostream>
#include <string>


using namespace std;

int main()
{
    string str;
    getline(cin, str);
    int count = 0;
    for (auto i = 0; i < str.size(); i++) {
        if (isalnum(str[i])) {
            count++;
        }
    }
    cout << count;
    return 0;
}