#pragma GCC optimize("O3")
#pragma GCC optimize("fast-math")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
#define inf 0x3f3f3f3f
using namespace std;
int a[100005], b[100005], n, ct, lungcuv, lung;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
    string s;
    while(fin >> s)
    {
        ct++;
        lungcuv = 0;
        for(int i = 0; s[i]; ++i)
        {
            if(isalpha(s[i]))
            {
                lungcuv++;
            }
        }
        lung += lungcuv;
    }
    fout << lungcuv / lung;
    return 0;
}