#include <stdio.h>
int cuv,lg,i,beg,end;
char c;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    while(scanf("%c",&c)!=EOF)
    {
        if((c>='a' && c<='z') || (c>='A' && c<='Z'))
        {
            while((c>='a' && c<='z') || (c>='A' && c<='Z'))
            {
                scanf("%c",&c);
                lg++;
            }
            cuv++;
        }

    }
    printf("%d",lg/cuv);
    return 0;
}