#include <stdio.h>

char crc;
unsigned long total,cuv,ok;

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

    while(!feof(stdin))
    {
        scanf("%c",&crc);

        if(crc>64&&crc<91||crc>96&&crc<123)
        {
            ++total;

            if(ok==0)
                ++cuv;

            ok=1;
        }
            else ok=0;
    }

    printf("%u",total/cuv);
}