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

ifstream in("text.in"); 
ofstream out("text.out"); 
 
 
int main(){ 
        
char s[1100000],d=26; 
        
int nrcuv,nrlit,i,n; 
       
in.get(s,1100000,d); 
        
in.get(); 
        
n=strlen(s); 
        
nrcuv=nrlit=0; 
        
if(isalpha(s[0])){ nrlit++; 
                          
nrcuv++; 
        
} 
        
for(i=1;i<n;i++){ 
            
if(isalpha(s[i])){ nrlit++; 
                
if(!isalpha (s[i-1])) nrcuv++; 
            
} 
        
} 
    
out<<nrlit/nrcuv; 
return 0; 
 
 
}