#include<bits/stdc++.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char ch;
int main()
{char alfabet[]="abcdefghijklmnopqrstuvwxyzABCDEFIJKLMNOPQRSTUVWXYZ";
int cuv=0,car=0;
while(f>>noskipws>>ch)
{if(strchr(alfabet,ch))
{cuv++;
while(strchr(alfabet,ch))
car++,f>>ch;
}
}
g<<car/cuv;
f.close();
g.close();
return 0;
}