#include <iostream>
#include <fstream>
using namespace std;

int main()
{ifstream f("text.in");
ofstream g("text.out");
 int cuv=0;
 int lit=0;
char _char;

while(f.get(_char)){
if((_char>='a'&&_char<='z')||(_char>='A'&&_char<='Z')){
    lit++;
}else
cuv++;
}

if((_char<'a'&&_char>'z')||(_char<'A'&&_char>'Z')){
  cuv--;
}
int c=lit/cuv;
g<<c;

f.close();
g.close();
    return 0;
}