#include<stdio.h>
#include<string.h>

int main()
{
    freopen("text.in", "r",stdin);
    freopen("text.out", "w", stdout);

    char c,a='0';
    int lit=0, cuv=0,ok=0;
    while((c=getchar())!=EOF)
    {
        if ((c>='A' && c<='Z')||(c>='a' && c<='z'))
            {++lit; ok=0;}
        else ++ok;
        if(ok==1 && lit!=0)
        cuv++;
    }

    printf("%d", lit/cuv);
    return 0;
}