#include<stdio.h>
#include<string.h>
char s;
int n,nr_lit,nr_cuv;
int main ()
{
    freopen("text.in","r",stdin),freopen("text.out","w",stdout);
    int i,aux=0;
    while (scanf("%c",&s)!= EOF) 
    {
        if((97<=s && s<=122) || (65<=s && s<=90))
        {
            ++nr_lit;
            aux=1;
        }
        else
        {
            nr_cuv+=aux;
            aux=0;
        }
    }
    printf("%d",nr_lit/nr_cuv);
    return 0;
}
//97 122 65 90