#include <stdio.h>

int main()
{
    char c;
    int litere=0,cuvinte=0,h=0;
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    while(scanf("%c", &c) != EOF)
    {       
           if(c >= 'a' && c <= 'z' || c>='A' && c<= 'Z')
           {
                litere++;
                h=1;
           }
           else if(h==1)
           {
                cuvinte++;
                h=0;
            }
    }
    if(h == 1)
         cuvinte++;
    printf("%d", litere/cuvinte);
    return 0;
}