#include<iostream.h>
#include<stdio.h>

unsigned long int litere,cuv;
char ch;


int main()
    {
    freopen("text.in","r",stdin);freopen("text.out","w",stdout);
    while(scanf("%[ \n]c",&ch)!=EOF)
               if((ch>='a' && ch<='z') || (ch>='A' && ch<='Z'))
                         {cuv++;
                         do {litere++;scanf("%c",&ch);}
                                             while((ch>='a' && ch<='z') || (ch>='A' && ch<='Z'));
                         }
    printf("%lu",litere/cuv);
    fclose(stdin);fclose(stdout);
    return 0;
}