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#include <bits/stdc++.h>
#define NMAX 10000005
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char sir[NMAX];
int main()
{
int cnt = 0, nrcuv = 0;
while(fin.getline(sir, NMAX))
{
int lg = strlen(sir);
for(int i = 0; i < lg; ++i)
{
int j = i;
while(isalpha(sir[j]) && j < lg)
++j;
cnt += j - i;
if(j > i)
++nrcuv;
i = j;
}
}
if(nrcuv == 0)
{
fout << 0 << '\n';
return 0;
}
fout << cnt / nrcuv << '\n';
return 0;
}