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#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
int valid(char x)
{
if(x>='a' && x<='z' || x>='A' && x<='Z')
return 1;
return 0;
}
int main()
{char s[1000],a;
long long nr=0,cuv=0;
int n,i;
ifstream f("text.in");
ofstream g("text.out");
f>>a;
if(valid(a)==1)
nr++;
while(f>>s)
{n=strlen(s);
for(i=0;i<n; i++)
{if(valid(s[i])==1)
nr++;
if(strchr(". /\|-1234567890!><,'`~!@#$%^&*\"()_-+=;:",s[i])!=0 && valid(a)==1)
cuv++;
a=s[i];}
if(strchr("./\|-1234567890!><,'`~!@#$%^&*\"()_-+=;:",a)==0)
cuv++;
}
g<<nr/cuv;
return 0;
}