#include <iostream>
#include <fstream>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int main()
{
    char chr,chr2;
    int lungime_cuv=0,nr_cuv=0;
    chr2='.';
    while(in.get(chr))
    {
        if((chr>='a' && chr <='z' ) || (chr>='A' && chr<='Z'))
            lungime_cuv++;
        else
            if((chr2>='a' && chr2 <='z' ) || (chr2>='A' && chr2<='Z'))
               nr_cuv++;
        chr2=chr;
    }
    out<<lungime_cuv/nr_cuv<<'\n';
    return 0;
}