import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.util.ArrayList;

import java.util.StringTokenizer;

public class TestClass {

public static void main(String[] args) throws IOException {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

StringTokenizer st;

int T = Integer.parseInt(br.readLine());

while(T --> 0) {

st = new StringTokenizer(br.readLine());

int target = Integer.parseInt(st.nextToken());

String str = st.nextToken();

ArrayList<Character> list = new ArrayList<Character>();

for(int row=0;row<str.length();row++) {

list.add((char) str.codePointAt(row));

}

list.remove(target-1);

for(Character result : list) {

bw.write(result+"");

}

bw.write("\n");

}

br.close();

bw.flush();

bw.close();

}

}