#include <iostream>
#include<cstdio>
#include<string.h>
using namespace std;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    int n,i,l=0,cuv=0;
    char c,cs;
    scanf("%c%c",&cs,&c);
    while(cs!=NULL&&cs!='\n')
    {
        if((cs>='a'&&cs<='z')||(cs>='A'&&cs<='Z'))
           l++;
        if(((c<'a'||c>'z')&&(c<'A'||c>'Z'))&&((cs>='a'&&cs<='z')||(cs>='A'&&cs<='Z')))
            cuv++;
        cs=c;
        scanf("%c",&c);
    }
    printf("%d", l/cuv);
    return 0;
}