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#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
long long int i,j,n,l,c,lit,cuv;
char s;
int main()
{
while( fin.get(s) )
{
if( ( s >= 'a' && s <= 'z' ) || ( s >= 'A' && s <= 'Z') )
{
++cuv;
++lit;
while( fin.get(s) && ( s >= 'a' && s <= 'z' ) || ( s >= 'A' && s <= 'Z' ) )
{
++lit;
}
}
}
fout<<lit/cuv;
return 0;
}