#include<cstdio>
#include<cstring>
#define InFile "text.in"
#define OutFile "text.out"
using namespace std;
unsigned long long lit,cuv;
char k;
bool ok;
int main()
{
    FILE *f=fopen(InFile,"r");
    FILE *g=fopen(OutFile ,"w");
    while(fscanf(f,"%c",&k)!=EOF)
    {

        while(k>='a'&&k<='z'||k>='A'&&k<='Z')
        {
            lit++;ok=true;
            fscanf(f,"%c",&k);
        }
        if(ok)cuv++,ok=false;
    }
    if(!lit||!cuv)fprintf(g,"0");else
       fprintf(g,"%d",lit/cuv);
    return 0;
}