#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

void store();
void enumerate();
void recall();
int longest = 0;
int posLongest = 0;

int main(){
	if((access("storage.txt",F_OK)) == 0){
			printf("Error: storage file already exists.");
			return 1;
			EXIT_FAILURE;
	}
	store();
	enumerate();
	recall();
	return 0;
}

void store(){

	FILE *fp;
	fp = fopen("storage.txt", "w");

	int i = 0;
	for(int c = getchar(); c != EOF; c = getchar()){
		fputc(c, fp);
	}
	fclose(fp);
}


//void enumerate() will step through the file and write the value of the 
//longest line encountered to int longest and the position (in terms of line
//number) in the file.
void enumerate(){

	int position = 1;
	int length = 0;

	FILE *fp;
	fp = fopen ("storage.txt", "r");
	for(int c = fgetc(fp); c != EOF; c = fgetc(fp))
		if(c != '\n'){
			++length;
			continue;
		} else if(c == '\n' && length > longest){
			longest = length;
			length = 0;
			posLongest = position;
			++position;
		} else if (c == '\n' && length < longest){ 
			++position;
			length = 0;
	}
	fclose (fp);
}

void recall (){
	FILE *fp;
	fp = fopen("storage.txt", "r");
	
	int position = 1;
	
	for(int c = fgetc(fp);; c = fgetc(fp)){
		if(position > posLongest)
			break;

		if(c == '\n'){
			++position;
			continue;
		}

		if(position == posLongest){
			putchar(c);
		}
	}
	fclose (fp);
	remove("storage.txt");
}