//# include <iostream>
# include <fstream>
# include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    char s[101];
    int nr_cuv=0, nr_lit=0, i;
    f.get(s, 101); f.get();
    for (i=0; i<strlen(s)-1; i++)
        if ((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
            nr_lit++;
        else
            if ((s[i+1]>='a' && s[i+1]<='z') || (s[i+1]>='A' && s[i+1]<='Z'))
                nr_cuv++;
    g<<nr_lit/nr_cuv;
    return 0;
}