#include <cstdio>
#include <cctype>
using namespace std;
int cuv,nrlit;
char c;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    do
    {
        scanf("%c",&c);
        if (!isalpha(c))continue;
        nrlit++;
        while(isalpha(c))
        {
            scanf("%c",&c);
            if (!isalpha(c))break;
            nrlit++;
        }
        cuv++;
    }
    while(!feof(stdin));
    printf("%d\n",nrlit/cuv);
    return 0;
}