my program is not taking spaces in a string. it is not counting the capital letters after space

#include <cstdlib>
#include <iostream>
#include<conio.h>
#include<string.h>
using namespace std;

int main()
{
    int upper=0;
    string s;
    int i;
    
     
    
cout<<"Enter a String";
cin>>s;
   
    for(i=0;i<=s.size();i++)
    {
        if(s[i]>='A'&& s[i]<='Z')
        {
        upper++;
    }
        
    }
  int len=s.length();
    cout<<" The Number of Upper case Letter is"<<upper;
    cout<<"length"<<len;
    getch();
    return 0;
    
}