#include <sstream>
#include <iostream>
#include <string.h>
#include <ios>

using namespace std;

 int main(int argc, char* argv[])
{
 if (argc<2)
 {
 cout<<"Usage word1 or word1 word2"<<endl;
 return(-1);
 }

 string c;
 if (argc==2)
     c="\0";
 else {
     c=argv[2];
     c.append(" ");
 }
 string s, str;

 cout<<"Input text:\n";



 while (cin)
 {

     cin>>s;
 if (s == argv[1]) {
    s=c;
    str.append(s);
 }
 else {
    str.append(s);
    str.append(" ");
 }

 }

 cout<<"\nYour edited text:\n"<<str<<" "<<endl;

 return(0);

}