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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[20000],*p,sep[]=",.?!- ";
int k,n,r,i;
int main()
{f.get(s,2000);
f.get();
n=strlen(s);
for(i=1;i<=n;i++)
if(strchr("qwertyuioplkjhgfdsazxcvbnm",s[i]))
r++;
p=strtok(s,sep);
while(p)
{
k++;
p=strtok(NULL,sep);
}
g<<r/k;
return 0;
}