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#include <iostream>
#include <string.h>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int nrlit,nrcuv;
char s[255],sep[]=" ,.?-_!;:";
int main()
{
f.getline(s,255);
for(int i=0;i<strlen(s);i++)
if( (s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z') )nrlit++;
char *p=strtok(s,sep);
while(p)
{
nrcuv++;
p=strtok(NULL,sep);
}
g<<nrlit/nrcuv;
return 0;
}