#include<cstdio>
using namespace std;
int lit(char c)
{
    if(c<'A'||(c>'Z'&&c<'a')||c>'z')
        return 0;
    return 1;
}
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    char c;
    int s=0,a=0;
    scanf("%c",&c);
    while(c!=EOF)
    {
        while(lit(c)==0&&c!=EOF)
            scanf("%c",&c);
        if(lit(c)==1)
            s++;
        while(lit(c)==1)
        {
            scanf("%c",&c);
            a++;
        }
    }
    printf("%d",a/s);
    return 0;
}