#include <stdio.h>
using namespace std;
char ch;
int cnt=1,fin,nrcuv;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    while(scanf("%c",&ch)!=-1 && ((ch<'a' || ch>'z') && (ch<'A' || ch>'Z')) );
    cnt=1;
    while(scanf("%c",&ch)!=-1)
    {
        if((ch<'a' || ch>'z') && (ch<'A' || ch>'Z'))
        {
            nrcuv++;
            while(scanf("%c",&ch)!=-1 && ((ch<'a' || ch>'z') && (ch<'A' || ch>'Z')) );
        }
        if((ch>='a' && ch<='z') || (ch>='A' && ch<='Z'))
            cnt++;
    }
    printf("%d",cnt/nrcuv);
    return 0;
}