#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
int main()
{
    int nrcuv,lg;
    char crt,ant;
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    ant=getchar();
    nrcuv=0;
    lg=0;
    while(ant!=EOF)
    {
        crt=getchar();
        if(isalpha(ant) && isalpha(crt))
            lg++;
        if(isalpha(ant) && !isalpha(crt))
            lg++,nrcuv++;
        ant=crt;
    }
    printf("%d\n",lg/nrcuv);

    return 0;
}