#include <cstdio>
#include <cctype>
#include <cstring>
using namespace std;
int i,nr,nrlitere;
char a[50000000];
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    gets(a);
    i=0;
    while(i<strlen(a))
    {
        while(!isalpha(a[i]))
            ++i;
        while(isalpha(a[i]))
        {
            nrlitere++;
            i++;
        }
        nr++;
    }
    printf("%d\n",nrlitere/nr);
    return 0;
}