#include <cstdio>
#include <cstring>
#include <cctype>
using namespace std;
FILE *f,*g;
char s[1000020];
int m,i,cuv,lit;
int main()
{
    f=fopen("text.in","r");
    g=fopen("text.out","w");
    fgets(s,1000010,f);
    if(strlen(s)>1000000)
        for(;;);
    while(s[i])
    {
        if(isalpha(s[i]))
        {
            cuv++;
            while(isalpha(s[i]))
            {
                lit++;
                i++;
            }
        }
        i++;
    }
    m=lit/cuv;
    fprintf(g,"%d\n",m);
    return 0;
}