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Cod sursa(job #859077)
#include <fstream>
#include<cstdio>
using namespace std;
fstream g("text.out", ios::out);
int main()
{
freopen("text.in","r",stdin);
long long n_cuv=0 , n_lit=0,s_lit=0;
char a;
while (scanf("%c",&a)>0)
{
if ((a>='a' && a<='z') || ( a>='A'&& a<='Z'))
n_lit++;
else if(n_lit)
{
s_lit+=n_lit;
n_lit=0;
n_cuv++;
}
}
g<<s_lit/n_cuv;
g.close();
return 0;
}