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