#include <iostream>
#include <string.h>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

void citire(char s[100])
{
    f.get(s,100);
    f.close();
}
int solve(char s[100])
{
    int nr=0,cont=0;
    for(int i=0;i<strlen(s);i++)
        if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
            nr++;
        else
            cont++;
    return nr/cont;
}
int main()
{
    char s[100];
    citire(s);
    g<<solve(s);
    g.close();
    return 0;
}