#include <fstream>
#include <string.h>
std::ifstream fin("text.in");
std::ofstream fout("text.out");
char s[1000000], count = 0, count1 = 0;
void citire()
{
     fin.getline(s, 1000000);
     for(int i =0; i< strlen(s); i++)
     {
             if((s[i]>= 'A' && s[i]<= 'Z') || (s[i]>= 'a' && s[i]<= 'z')) count++;
             else if((s[i-1]>= 'A' && s[i-1]<= 'Z') || (s[i-1]>= 'a' && s[i-1]<= 'z')) count1++;
     }
}
void afisare()
{
     fout<<count/count1<<"\n";
}
int main()
{
    citire();
    afisare();
    return 0;
}