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#include <bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s;
int n, nrcuv, lg;
int main()
{
nrcuv=0;
while(fin.get(s))
{
if((s >= 'a' && s <= 'z') || (s >= 'A' && s <= 'Z'))
{
while((s>= 'a' && s <= 'z') || (s >= 'A' && s <= 'Z'))
{
lg++;
fin.get(s);
}
nrcuv++;
}
}
fout<<lg/nrcuv<<"\n";
fout.close();
return 0;
}