#include <cstdio>

using namespace std;

int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    int ok=0;
    unsigned long long total=0,cuvinte=0;
    char x;
    while(x!='\n')
    {
        scanf("%c",&x);
        if(x=='\n') break;
        else
        {
            if((x>='A'&&x<='Z')||(x>='a'&&x<='z'))
            {
                total++;
                ok=1;
            }
            else if(ok==1) {cuvinte++;ok=0;}
        }

    }
    if(total==0||cuvinte==0) printf("0");
    else printf("%llu",total/cuvinte);
}