Answer 5 Strings CPP

#include<iostream>
#include<string>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    string str;
    int t;
    cin>>t;
    while(t>0)
    {
        cin>>str;
        int k=str.size();
        int i=0;
        while(i<=k)
            {
                if(str.substr(i,5)=="party")
                {
                    str.replace(i,5,"pawri");
                }
                i++;
            }
    cout<<str<<endl;
    t--;
    }
    return 0;
}