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#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main(){
char c[100000],x[100000];
char alf[]="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
while(!f.eof()){
f.getline(x,1000);
strcat(c,x);
}
int i,j;
int k=0,spat=1;
for(i=0;i<strlen(c);i++){
for(j=0;j<strlen(alf);j++){
if(c[i]==alf[j])
k++;
}
}
for(i=0;i<=k;i++){
if(c[i]==' ' || c[i]=='-' )spat++;
}
g<<float(k/spat);
}