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#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int isletter(char a)
{
if(a>='a'&&a<='z')return 1 ;
if(a>='A'&&a<='Z')return 1;
return 0;
}
char s[25000000];
int t[25000000];
int main()
{
int l=0;
int c=0;
in.getline(s,100000000000);
for(int i=0;i<strlen(s);i++)
{
t[i]=isletter(s[i]);
l+=t[i];
if(t[i]==0&&i>0)c++;
}
out<<l/c;
}