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#include <iostream>
#include <stdio.h>
#include <ctype.h>
#include<stdio.h>
#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main ()
{
int i=0;
string str;
while(fin){
getline(fin, str);
}
int nrcuvinte=0;
int caractere=0;
bool cuv=0;
i=0;
while (str[i])
{
if (isalpha(str.at(i))){
caractere++;
if(cuv==0){
nrcuvinte++;
}
cuv=1;
}
else{
cuv=0;
}
i++;
}
fout <<caractere/nrcuvinte<<endl;
return 0;
}