#include <bits/stdc++.h>
using namespace std;
char c;
long long nrL,nrCuv;

void cit()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
}
int main()
{
    cit();

    scanf("%c",&c);
    while(c!='\n')
    {
        if(c>='a' && c<='z') {
                    while(c>='a' && c<='z') {
                    nrL++;
                    scanf("%c",&c);
                }
                nrCuv++;
        }
            scanf("%c",&c);
    }

    printf("%lld",nrL/nrCuv);

    return 0;
}