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#include <iostream>
#include <fstream>
#include <string>
using namespace std;
ifstream in ("text.in");
ofstream out("text.out");
char ch;
int lent=0, nrcuv=0;
bool cuvdisp=true;
int main()
{
while(in.get(ch))
{
if(isalpha(ch))
{
lent++;
if(cuvdisp==true)
{
cuvdisp=false;
nrcuv++;
}
}
else
cuvdisp=true;
}
if(nrcuv==0)
{
out<<0;
return 0;
}
out<<lent/nrcuv;
return 0;
}