#include<iostream>
#include<string>
using namespace std;
int main()
{
    int i ,litera=0;
    char s[100];
    cin.getline(s,100);
    for(i=0;i<strlen(s);i++)
    {
    
                            if(s[i]>='a'&& s[i]<='z' || s[i]>='A' && s[i]<='Z')
                            
                            litera++; }
                            cout<<litera;
                            
                            
                            
                            
                            system("pause");
                            return 0;}