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460 B

#include <bits/stdc++.h>
using namespace std;
const int N = 110;
int a[N], al;
void check(int n,int m){
al = 0;
while(n){
int x = n % m;
a[++al] = x;
n /= m;
}
for (int i = al; i >= 1; i--){
printf("%d", a[i]);
}
puts("");
}
int main() {
int n;
cin >> n;
int a, b;
for (int i = 1; i <= n;i++){
cin >> a >> b;
check(a, b);
}
return 0;
}