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#include<iostream>
#include<string>
using namespace std;
#include<fstream>
ifstream f("text.in");
ofstream g("text.out");
char sir[256];
int i;
int litere(char x)
{
if((x>='A'&& x<='Z') || (x>='a' && x<='z')) return 1;
else return 0;
}
int main()
{
f.get(sir,255);
int s=0, c=1;
int n=strlen(sir);
for(i=0;i<n;i++)
{
if(litere(sir[i])) s=s+1;
else
if(litere(sir[i+1])) c=c+1;
}
g<<s/c;
return 0;
}