#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main(int argc, char **argv){

	const int buff_size = 1024;
	ofstream fout;
	ifstream fin;
	string input, delim;
	char buff[buff_size];
	
	if(argc < 4){
		cout << "Usage: ./a.out <infile> <delimeter> <outfile>" << endl;
		cout << "Enter input filename: ";	cin >> input;
		fin.open(input.c_str());
		
		cout << "Enter output filename: ";	cin >> input;
		fout.open(input.c_str());
		
		cout << "Enter delimeter: ";	cin >> input;
		delim.assign(input);
	}else{
		fin.open(argv[1]);
		fout.open(argv[3]);
		delim.assign(argv[2]);
	
		cout << "Searching " << argv[1] << " for " << delim << endl;
		cout << "Output directed to " << argv[3] << endl;
	}

	cout << endl;

	while(!fin.eof()){
		fin.getline(buff, (streamsize)buff_size);
		input.assign(buff);
		
		string::size_type index;
		while((index = input.find(delim, 0)) != string::npos){
			string rep;
			cout << input << endl << "Enter string to replace " << delim << ": ";
			cin >> rep;
			input.erase(index, delim.length());
			input.insert(index, rep);
			input.append(1, 'n');
		}
		
		fout << input;
	}

	fin.close();
	fout.close();
}