#include <iostream>
#include <fstream>
#include <ctype.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char a[1000001];
int main()
{int n=0,i;
char x;
while(f>>noskipws>>x)
a[++n]=x;
unsigned int n1=0,n2=0;
for(i=1;i<=n;i++)
if(isalpha(a[i])) n1++;
i=1;
while(i<=n)
{
    if(isalpha(a[i]))
    {
        n2++;
        while(isalpha(a[i]))
        i++;
    }
    i++;
}
g<<n1/n2;
    return 0;
}