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

int main()
{
    int nc=0,r=0,i=0;
    char t=' ',c=' ';
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    while (c!='$')
    {
        c='$';
        scanf("%c",&t);
        c=t;
        if (c=='$' || c=='\n')
            break;
        if (((int)t-0>=65 && (int)t-0<=90) || ((int)t-0>=97 && (int)t-0<=122))
        {
            r++;
            if (i==0)
            {
                nc++;
                i=1;
            }
        }
            else
                i=0;
    }
    printf("%d",r/nc);
    return 0;
}