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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
bool litera (char x)
{
if ((x>='a' && x<='z') || (x>='A' && x<='Z')) return true;
return false;
}
int main()
{
char s[1000];
f.getline(s,1001);
int n=strlen(s),amcuv=0,lc=0,nrcuv=0,lt=0;
for (int i=0;i<n;i++)
{
if (litera(s[i])==true)
{
amcuv=1;
lc++;
}
else if (amcuv==1)
{
amcuv=0;
lt+=lc;
nrcuv++;
lc=0;
}
}
if (amcuv==1)
{
lt+=lc;
nrcuv++;
}
g<<lt/nrcuv;
f.close();
g.close();
return 0;
}