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Cod sursa(job #283220)
#include<fstream>
#include<string.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char a[4000000];
long c,e;
int main()
{ fin.getline(a,4000000);
for(long i=0;i<strlen(a);i++)
if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z')) c++;
else if((a[i-1]>='a'&&a[i-1]<='z')||(a[i-1]>='A'&&a[i-1]<='Z'))e++;
if((a[strlen(a)-1]>='a'&&a[strlen(a)-1]<='z')||(a[strlen(a)-1]>='A'&&a[strlen(a)-1]<='Z')) e++;
fout<<c/e;
fin.close();
fout.close();
return 0;
}