#include <fstream>
#include <iostream>
 
using namespace std;
 
int main()
{
	char command;
	char infilename[80];
	char outfilename[80];
	char fileline[80];
	char nextline[80];
	char temp[80];
	char temp2[80];
	char * location;
	char sentence[250];
	int loc = 0;
	char log[250][80];
	int x = 0;
	int y = 0;
	fstream infile;
	fstream outfile;
 
	cout << "Enter instructions file name: ";
	cin >> infilename;
 
	infile.open(infilename, ios::in);
	outfile.open("output", ios::out);
 	if(!infile)
 	{
		cout << "File doesn't exist, exiting.\n";
		exit(1);
 	}
 
	infile.getline(sentence, 80);
	outfile << sentence << endl;
 
	do
	{	
		infile >> command;
	    infile.getline(fileline, 80);
		cout << command << fileline << endl;
		if(command == 'I')
		{
 
			infile >> command;
			infile.ignore(10, ' ');
			infile.getline(nextline, 80);
			cout << command << " " << nextline << endl;
 
			if(command=='A')
			{
				location = strstr(sentence, nextline);
 
				location += strlen(nextline);
 
				strcpy(temp2, location);
				strcpy(location, fileline);
				location += strlen(fileline);
				strcpy(location, temp2);
				location += strlen(temp2);
 
				strcpy(temp, "");
				x++;
				outfile << sentence <<endl;
 
			}
			else if(command=='B')
			{
				location = strstr(sentence, nextline);
				strcpy(fileline, fileline + 1);
				strcat(fileline, " ");
				strcpy(temp2, location);
				strcpy(location, fileline);
				location += strlen(fileline);
				strcpy(location, temp2);
				location += strlen(temp2);
				outfile << sentence << endl;
				strcpy(temp, "");
				x++;
 
 
			}
			else if(command != ('A' || 'B'))
			{
				cout << "Input file corrupt, exiting...\n";
 
			}
 
		}
 
		else if(command == 'R')
		{
			location = strstr(sentence, fileline);
			strcpy(location, (location + strlen(fileline)));
			outfile << sentence << endl;
			x++;
 
		}
 
		else
		{
			cout << "Input file corrupt, exiting...\n";
		}
 
	}
	while(!infile.eof());
 
	infile.close();
	outfile.close();
 
	char readin[80];
 
	outfile.open("output", ios::in);
 
	while(!outfile.eof())
	{
        outfile.getline(readin, 80);
        cout << readin << endl;
    }
 
	outfile.close();
 
}

 cout << command << " " << nextline << endl;

 cout << command << " ";