#include <cstdio>
#include <cstring>
#include <cctype>

using namespace std;

FILE *fin=freopen("text.in","r",stdin);
FILE *fout=freopen("text.out","w",stdout);

int main()
{
    char s[1000000];
    int nrc=0,l=0;
    while(!feof(stdin))
    {
        gets(s);
        int lg=strlen(s);
        for(int i=0;i<lg;i++)
        {
            if(isalpha(s[i])){
                l++;
            if(!isalpha(s[i+1]))
                nrc++;
            }
        }
    }
    printf("%d",l/nrc);
    return 0;
}