#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    char x,y;
    int lit=0,cuv=0;
    x=getchar();
    while(x!=EOF)
    {
        y=x;
        x=getchar();
        if((y>='a'&&y<='z')||(y>='A'&&y<='Z'))
        {
            lit++;
            if(x!=EOF&&((x<'a'||x>'z')&&(x<'A'||x>'Z')))
                cuv++;
        }
    }
    cout<<lit/cuv;
    return 0;
}