#include <cstdio>

using namespace std;

int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    int sum=0,nr=0;
    char ch,chl=NULL;
    while(scanf("%c",&ch)!=EOF){
        if((ch>='a' and ch<='z')or (ch>='A' and ch<='Z'))
            sum++;
        else
            if((chl>='a' and chl<='z')or (chl>='A' and chl<='Z'))
                nr++;
        chl=ch;
    }
    printf("%d\n",sum/nr);
    return 0;
}