#include <iostream>
#include <cstdio>
using namespace std;

int main()
{
    FILE *f=fopen("text.in","r");
    freopen("text.out","w",stdout);
    char c;
    int Nr_Of_Letters=0;
    int Nr_Of_Words=0;
    char c_aux='a';
    while(fscanf(f,"%c",&c)!=EOF)
    {
        if( (c >='a' && c<='z') || (c>='A' && c<='Z') )
        {
            Nr_Of_Letters++;
            if( (c_aux <'a' || c_aux>'z') && (c_aux<'A' || c_aux>'Z'))
                {Nr_Of_Words++;c_aux=c;}
        }
        else
            c_aux=c;
    }
    printf("%d",Nr_Of_Letters/Nr_Of_Words);
    return 0;
}