#include<cstdio>
#include<algorithm>
#include<cstring>
int n,i,l,nrc,ok;
char s,ch;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    while (scanf("%c",&s))
    {
        if ((s<='Z' && s>='A') || ( s<='z' && s>='a' )) l++,ok=1;
        else if (ok)
        ok=0,nrc++;
        if (s=='\n') break;
    }
    printf("%d",l/nrc);
    return 0;
}