using namespace std;
#include<fstream>

FILE *f=fopen ("text.in", "r");
ofstream g ("text.out");




int main()
{
    char c,c1;
    int nrcuv=0,nrlit=0;

    fscanf(f,"%c",&c);
    if((c>='a' && c<='z') || (c>='A' && c<='Z'))
    {
        nrlit++;
        nrcuv++;
    }
    c1=c;
    while(c1!='\n' && c1!=NULL)
    {
        fscanf(f,"%c",&c1);
        if((c1>='a' && c1<='z') || (c1>='A' && c1<='Z'))
        {
            nrlit++;
            if(!((c>='a' && c<='z') || (c>='A' && c<='Z'))) nrcuv++;
        }
        c=c1;
    }

    if(!nrcuv) g<<0;
    else g<<nrlit/nrcuv;


    return 0;
}