#include <iostream>
#include <fstream>
#include <string.h>

using namespace std;
ifstream f("text.in");
ofstream g("text.out");

char a[255];
long cuv=0;
long car=0;

int main()
{
    while(!f.eof())
    {
        f>>a;
        long nrl=0;
        for(int i=0;i<strlen(a);i++)
            if(((a[i]>='a')&&(a[i]<='z'))||((a[i]>='A')&&(a[i]<='Z')))
            nrl++;
            cout<<nrl<<endl;
    }
    f.close();
    g.close();
}