#include <iostream>
#include <cstdio>
#include <string>
using namespace std;
 
//BFF -- best friend forever
//IDK -- I don't know
//JK -- just kidding
//TMI -- too much information
//TTYL -- talk to you later
 
int main(){
 
   int i;
   string input,output;
 
   string bff = "best friend forever";
   string idk = "I don't know";
   string jk = "just kidding";
   string tmi = "too much information";
   string ttyl = "talk to you later";
 
 
 
 
   cout<<"Enter text: ";
   getline(cin,input);
 
   input.resize(2*input.size());
 
  output = input;
 
   for( i = input.find("BFF");i>=0; i = output.find("BFF")){
 
 
       output.replace(i,3,bff);
   }
 
   i = input.find("IDK");
 
   if(i>=0){
 
       output = input;
       output.replace(i,3,idk);
   }
 
 
 
 
 
 
    cout<<"\nYou entered: "<<input;
    cout<<"\nExpanded: "<<output;
 
 
    return 0;
}

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

WW91ciBCRkYsIG15IEJGRiwgYW5kIGhlciBCRkYgYXJlIGFsbCB0aGVyZS4=

Your BFF, my BFF, and her BFF are all there.