2018-05-08 01:00 UTC

Contest 8 May


2018-05-08 06:00 UTC
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Problem A
Software Bugs

Not all bugs are insects. There are also certain kinds of bugs that may become a real nightmare for software developers. You definitely know the situation when a user calls to say “Hey, I’ve found a bug in your program.” Once you have located and removed the bug, another one appears immediately. It is a hard and never-ending process.

Recently, there appeared a promising open-source initiative called the Bug Preprocessor. The preprocessor is a program able to find all bugs in your source code and mark them, so they are relatively easy to remove. Your task is to write a program that will remove all marked bugs from the preprocessed source code.


The input contains at most $250$ test cases. Each test case starts with a line containing one integer number $T$ ($0\le T\le 100\, 000$), one space and a string $B$ used by the preprocessor to mark all bugs. The next $T$ lines then contain the preprocessed source code. All bugs are represented by a case-sensitive string $B$.

Each line of the input will be between $0$ and $2\, 000\, 000$ characters long. The bug marker $B$ consists of at least $1$ and at most $1\, 000$ uppercase letters (A through Z). There will be at most $10\, 000\, 000$ characters in each test case.


Your program must remove all of the bugs and produce the same result as if the first occurrence of $B$ on each line was removed repeatedly, until there is no other existing occurrence of $B$. Nothing else may be removed, not even spaces.

Sample Input 1 Sample Output 1
print "No bugs here..."

void hello() {
  printfBBUGUG("Hello, world!\n");

wriERRERRtelERERRRn("Hello E-R-R");
print "No bugs here..."

void hello() {

  printf("Hello, world!\n");

writeln("Hello E-R-R");