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#include <iostream>
#include<string.h>
#include<stdio.h>
#include<stdlib.h>
using namespace std;
char s[1000000];
int g,j,i;
int main()
{
gets(s);
for(i=1;i<=strlen(s);i++){
if((s[i]!=' ')&&(s[i]!='-')&&(s[i]!=',')&&(s[i]!='!')&&(s[i]!='?')&&(s[i]!='.')){
j=j+1;
}
if((s[i]==' ')||(s[i]=='-')||(s[i]=='!')||(s[i]=='?')||(s[i]=='.')) {
g++;
}
}
if ((s[strlen(s)]!='.') ||(s[strlen(s)]!='!') ||(s[strlen(s)]!='?')){ g=g+1;}
cout<<j/g;
return 0;
}