#include <cstdio>

using namespace std;

FILE* in;
FILE* out;

bool isLetter(char x)
{
    return ((x >= 'a' && x <= 'z') || (x >= 'A' && x <= 'Z'));
}

int main()
{
    in = fopen("text.in", "r");
    out = fopen("text.out", "w");

    long long wordNo = 0, totalLength = 0;
    bool isNewWord = true;
    char x;
    while(fscanf(in,"%c",&x) != EOF)
    {
        if(isLetter(x))
        {
            totalLength++;
            if(isNewWord)
            {
                wordNo++;
            }
            isNewWord = false;
        }
        else
        {
            isNewWord = true;
        }
    }
    fprintf(out, "%lld", totalLength/wordNo);
    return 0;
}