#include using namespace std;

int main() {

int s=0;
char str[100] = { 0 };
int len =sizeof(str)/sizeof(str[0]);
cin.getline(str,100);
// write your code here......
for(int i=0;i<len;i++)
{
  if(str[i]>='a'&&str[i]<='z'|| str[i]==' '||str[i]>='0'&&str[i]<='9')
  {
    s++;
  }
}
cout<<s<<endl;
return 0;

}