#include <fstream>
std::ifstream fin("text.in");
std::ofstream fout("text.out");
int main()
{
    char s[500000];
    int count = 0, count1 = 0;
    fin.getline(s, 500000);
    for(int i =0; i< std::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++;
    }
    fout<<count/count1<<"\n";
    return 0;
}