#include <stdio.h>

int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    char c;
    int i=0,nrl=0;
    c = fgetc(stdin);
    int ok;
    while(!feof(stdin))
        {ok=0;
         while(c>='a'&&c<='z' || c>='A'&&c<='Z')
            {
             nrl++;
             c = fgetc(stdin);
             ok=1;
             }
         if(ok==1)
            i++;
         c = fgetc(stdin);
         }


    printf("%ld",(nrl)/i);
    return 0;
}