# include <cstdio>
using namespace std;
int k,sum;
char c1,c2;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    c1=' ';sum=k=0;
    while( scanf("%c",&c2) )
    {
        if(((65<=c2)&&(c2<=90))||((97<=c2)&&(c2<=122)))sum++;
        else if(((65<=c1)&&(c1<=90))||((97<=c1)&&(c1<=122)))k++;
        c1=c2;
        if(c2=='\n')break;
    }
    printf("%d\n",sum/k);
}