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#include <iostream>
#include <string.h>
#include <cstring>
#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[1000],sep[]=".?!,;- ",*c;
int i,nr,l,m;
int main()
{
fin.get(s,1000);
for(i=0;i<strlen(s);i++)
{
if(s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z')
{
l++;
}
}
c=strtok(s,sep);
while(c)
{
nr++;
c=strtok(NULL,sep);
}
m=l/nr;
cout<<m;
}