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#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
int i,o,d,j,pi;
char s[255],*p;
int main()
{
ifstream f("text.in");
ofstream g("text.out");
f.get(s,255);
p=strtok(s," ");
while(p)
{
o++;
d=strlen(p);
pi=0;j=0;
while(j<=d)
{
if(((p[j]<='z')&&(p[j]>='a'))||((p[j]<='Z')&&(p[j]>='A')))
pi++;
j++;
}
i=pi+i;
p=strtok(NULL," ");
}
i=i/o;
g<<i;
f.close();
g.close();
return 0;
}