#include <stdio.h>
#include <string.h>
int cuv,lg,i,n;
char s[100000];
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    gets(s);
    n=strlen(s);
    while(i<=n)
    {
        while(!((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))) i++;
        while((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
        {
            lg++;
            i++;
        }
        cuv++;
    }
    printf("%d",lg/cuv);
    return 0;
}