#include<iostream.h>
#include<string.h>
#include<fstream.h>
   int main()
   
   {ifstream f("atestat.in");
	   char s;int c=0,i;
   f>>s;
for(i=0;i<100;i++)
	{if(s>='a'&&s<='z'&&s>='A'&&s<='Z'&&" ")
		
		c++;
	}
	cout<<c;   
	   
	   
   }