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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
const string lim=" -,.!?;:";
bool cuv(char a)
{
for(int i=0;i<=lim.size();i++)
{
if(a==lim[i])return 1;
}
return 0;
}
int main()
{
string s;
float cont=0, c=0;
getline(fin,s);
for(int i=0;i<=s.size();i++)
{
if((s[i]>='a' && s[i]<='z')||(s[i]>='A' && s[i]<='Z'))cont++;
}
for(int i=1;i<=s.size();i++)
{
if(cuv(s[i])==0 && cuv(s[i-1])==1)++c;
}
fout<<int(cont/c);
return 0;
}