#include<stdio.h>
char c;
int x[1100000],i=1,ok=0,s=0;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    while(scanf("%c",&c)==1)
    {
        if(((c>='a')&&(c<='z'))||((c>='A')&&(c<='Z')))
        {
            ++x[i];
            ok=1;
        }
        else if(ok==1)
        {
            s=s+x[i];
            ++i;
            ok=0;
        }
    }
    if(i==1)
        printf("%d",x[1]);
    else
        printf("%d",s/(i-1));
    return 0;
}