//Bou Marian Catalin
#include<fstream.h>
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{char c,p,i;
long l=0,cuv=0,j,jp;
p=',';jp=0;
while(!fin.eof())
{fin>>c;
j=0;
for(i='a';i<='z';i++)if(c==i)j=1;
for(i='A';i<='Z';i++)if(c==i)j=1;
if(j)l++;
else if(jp)cuv++;
p=c;jp=j;}
//if(jp)cuv++;
fout<<l/cuv;
return 0;}