#include<cstdio>
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    char u,l;
    int lit = 0,cuv = 0;
    scanf("%c",&u);
    if(u>='A' && u<='Z' || u>='a' && u<='z')
    {
        lit++;
        cuv++;
    }
    while(scanf("%c",&l)!=EOF)
    {
        if(!(l>='A' && l<='Z' || l>='a' && l<='z'))
        {
            u = l;
            continue;
        }
        lit++;
        if(!(u>='A' && u<='Z' || u>='a' && u<='z'))
            cuv++;
        u=l;
    }
    printf("%d",lit/cuv);
    return 0;
}