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#include<fstream>
#include<ctype.h>
#include<stdio.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[1000][1000];
int i=1,n,m=0,j,n1;
int main()
{
f>>s[i];
while(!f.eof())
{n=i; i++; f>>s[i]; }
for(i=1;i<=n;i++)
{for(j=0;j<=' ';j++)
if(isalpha(s[i][j])) m++; //verific sa fie intre A..Z sau a..z
}
g<<m/n;
return 0;
}