#include<stdio.h>
#include<iostream>
#include<vector>
#include<bits/stdc++.h>
using namespace std;
int main(){
int a;
scanf("%d", &a);
while(a--){
bool flag = false;
string t;
int value, tamanho;
cin>>tamanho;
cin>>value;
getchar();
cin>>t;
for(int i =0; i<=tamanho && !flag; i++){
if(value > t[i]-'0'){
t.insert(i, to_string(value));
flag = true;
}
}
cout<<t<<endl;
}
}
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973. K Closest Points to Origin | 969. Pancake Sorting |
967. Numbers With Same Consecutive Differences | 957. Prison Cells After N Days |
946. Validate Stack Sequences | 921. Minimum Add to Make Parentheses Valid |
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528. Random Pick with Weight | 470. Implement Rand10() Using Rand7() |
866. Prime Palindrome | 1516A - Tit for Tat |
622. Design Circular Queue | 814. Binary Tree Pruning |
791. Custom Sort String | 787. Cheapest Flights Within K Stops |
779. K-th Symbol in Grammar | 701. Insert into a Binary Search Tree |
429. N-ary Tree Level Order Traversal | 739. Daily Temperatures |
647. Palindromic Substrings | 583. Delete Operation for Two Strings |
518. Coin Change 2 | 516. Longest Palindromic Subsequence |
468. Validate IP Address | 450. Delete Node in a BST |